Column order problem after pivoting

Hi, 

I am facing an issue of ordering the cloumns after pivoting. The index attribute is Week no. Now when I pivot the data, the columns go like : Week-1, week-10, Week-11......Week-2, Week-20,.....Week-3, Week-30,....

Whereas I need it to be :  Week-1, Week-2, Week-3.....

<?xml version="1.0" encoding="UTF-8"?><process version="7.5.001">
  <context>
    <input/>
    <output/>
    <macros/>
  </context>
  <operator activated="true" class="process" compatibility="7.5.001" expanded="true" name="Process">
    <process expanded="true">
      <operator activated="true" class="generate_macro" compatibility="7.5.001" expanded="true" height="82" name="Generate Macro" width="90" x="112" y="85">
        <list key="function_descriptions">
          <parameter key="end_date" value="date_str_custom(date_add(date_now(), -1, DATE_UNIT_DAY), &quot;yyyy-MM-dd&quot;)"/>
        </list>
      </operator>
      <operator activated="true" class="subprocess" compatibility="7.5.001" expanded="true" height="82" name="Subprocess" width="90" x="246" y="85">
        <process expanded="true">
          <operator activated="true" class="jdbc_connectors:read_database" compatibility="7.5.001" expanded="true" height="68" name="Read Database (2)" width="90" x="45" y="34">
            <parameter key="connection" value="DVDH_zDMaqsud"/>
            <parameter key="query" value="SELECT  `Candidate`&#10;FROM `Candidate_Name_List`&#10;-- where Candidate like '%cliff%'"/>
            <enumeration key="parameters"/>
          </operator>
          <operator activated="true" class="r_scripting:execute_r" compatibility="7.2.000" expanded="true" height="82" name="Execute R" width="90" x="179" y="34">
            <parameter key="script" value="# rm_main is a mandatory function, &#10;# the number of arguments has to be the number of input ports (can be none)&#10;rm_main = function(input_data)&#10;{&#10;    library(gtrendsR)&#10;    for (i in 1:nrow(input_data)) {&#10;    &#9;&#9;trend &lt;- data.frame(gtrends(input_data$Candidate[i], time = &quot;2017-01-01 %{end_date}&quot;)$interest_over_time)&#10;    &#9;&#9;if ( i == 1) {&#10;    &#9;&#9;&#9;all_trends &lt;- trend&#10;    &#9;&#9;} else {&#10;    &#9;&#9;&#9;all_trends &lt;- rbind(all_trends, trend)&#10;    &#9;&#9;}&#10;    }&#10;    all_trends$date &lt;- as.character(all_trends$date)&#10;    return(all_trends)&#10;}&#10;"/>
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          <operator activated="true" class="select_attributes" compatibility="7.5.001" expanded="true" height="82" name="Select Attributes (2)" width="90" x="313" y="34">
            <parameter key="attribute_filter_type" value="subset"/>
            <parameter key="attributes" value="date|keyword|hits"/>
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          <operator activated="true" class="nominal_to_date" compatibility="7.5.001" expanded="true" height="82" name="Nominal to Date (2)" width="90" x="447" y="34">
            <parameter key="attribute_name" value="date"/>
            <parameter key="date_format" value="yyyy-MM-dd"/>
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          <connect from_op="Read Database (2)" from_port="output" to_op="Execute R" to_port="input 1"/>
          <connect from_op="Execute R" from_port="output 1" to_op="Select Attributes (2)" to_port="example set input"/>
          <connect from_op="Select Attributes (2)" from_port="example set output" to_op="Nominal to Date (2)" to_port="example set input"/>
          <connect from_op="Nominal to Date (2)" from_port="example set output" to_port="out 1"/>
          <portSpacing port="source_in 1" spacing="0"/>
          <portSpacing port="source_in 2" spacing="0"/>
          <portSpacing port="sink_out 1" spacing="0"/>
          <portSpacing port="sink_out 2" spacing="0"/>
        </process>
      </operator>
      <operator activated="true" class="date_to_numerical" compatibility="7.5.001" expanded="true" height="82" name="Date to Numerical" width="90" x="380" y="85">
        <parameter key="attribute_name" value="date"/>
        <parameter key="time_unit" value="week"/>
        <parameter key="keep_old_attribute" value="true"/>
      </operator>
      <operator activated="true" class="sort" compatibility="7.5.001" expanded="true" height="82" name="Sort" width="90" x="514" y="85">
        <parameter key="attribute_name" value="date_week"/>
      </operator>
      <operator activated="true" class="rename" compatibility="7.5.001" expanded="true" height="82" name="Rename" width="90" x="648" y="85">
        <parameter key="old_name" value="keyword"/>
        <parameter key="new_name" value="Candidate"/>
        <list key="rename_additional_attributes"/>
      </operator>
      <operator activated="true" class="generate_attributes" compatibility="7.5.001" expanded="true" height="82" name="Generate Attributes (3)" width="90" x="782" y="85">
        <list key="function_descriptions">
          <parameter key="Scaled_Value" value="((hits)*100)"/>
        </list>
      </operator>
      <operator activated="true" class="select_attributes" compatibility="7.5.001" expanded="true" height="82" name="Select Attributes" width="90" x="916" y="85">
        <parameter key="attribute_filter_type" value="subset"/>
        <parameter key="attributes" value="Candidate|date_week|hits|Scaled_Value"/>
      </operator>
      <operator activated="true" class="aggregate" compatibility="7.5.001" expanded="true" height="82" name="Aggregate" width="90" x="1050" y="85">
        <list key="aggregation_attributes">
          <parameter key="Scaled_Value" value="sum"/>
        </list>
        <parameter key="group_by_attributes" value="date_week|Candidate"/>
      </operator>
      <operator activated="true" class="pivot" compatibility="7.5.001" expanded="true" height="82" name="Pivot" width="90" x="1184" y="85">
        <parameter key="group_attribute" value="Candidate"/>
        <parameter key="index_attribute" value="date_week"/>
      </operator>
      <operator activated="true" class="rename_by_replacing" compatibility="7.5.001" expanded="true" height="82" name="Rename by Replacing" width="90" x="1318" y="85">
        <parameter key="include_special_attributes" value="true"/>
        <parameter key="replace_what" value="(sum\(Scaled_Value\)_)"/>
        <parameter key="replace_by" value="Week-"/>
      </operator>
      <connect from_port="input 1" to_op="Generate Macro" to_port="through 1"/>
      <connect from_op="Generate Macro" from_port="through 1" to_op="Subprocess" to_port="in 1"/>
      <connect from_op="Subprocess" from_port="out 1" to_op="Date to Numerical" to_port="example set input"/>
      <connect from_op="Date to Numerical" from_port="example set output" to_op="Sort" to_port="example set input"/>
      <connect from_op="Sort" from_port="example set output" to_op="Rename" to_port="example set input"/>
      <connect from_op="Rename" from_port="example set output" to_op="Generate Attributes (3)" to_port="example set input"/>
      <connect from_op="Generate Attributes (3)" from_port="example set output" to_op="Select Attributes" to_port="example set input"/>
      <connect from_op="Select Attributes" from_port="example set output" to_op="Aggregate" to_port="example set input"/>
      <connect from_op="Aggregate" from_port="example set output" to_op="Pivot" to_port="example set input"/>
      <connect from_op="Pivot" from_port="example set output" to_op="Rename by Replacing" to_port="example set input"/>
      <connect from_op="Rename by Replacing" from_port="example set output" to_port="result 1"/>
      <portSpacing port="source_input 1" spacing="0"/>
      <portSpacing port="source_input 2" spacing="0"/>
      <portSpacing port="sink_result 1" spacing="0"/>
      <portSpacing port="sink_result 2" spacing="0"/>
    </process>
  </operator>
</process>

It seems it is sorting out based on first digit of the week no.

Please advise.