Overlapping of Hexa elements in ACM welds

I am welding two plates of 5mm thick using ACM welds. I am using the 'spot panel' in the 1D connector tab. Following are the inputs:

 

Location : Lines

spacing : 1.00

num layers : total 2

tolerance : 20

type : acm (shell gap)

diameter : 2

 

Though the connectors are realized, I find the overlapping of the HEXA elements. What could be the reason behind this and the solution to avoid the same?

 

Attached .bdf file

 

Thanx in advance /emoticons/default_smile.png' srcset='/emoticons/smile@2x.png 2x' title=':)' width='20' /> 

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