Sum-SPCF Problem

Dear Everyone, I have a problem with Sum-SPCF.

Basicly, I have already export SPCF  for X-dir (.csv). Next step, I calculate sum all value by ∑SUM function in exel.

But this value is rather different from OptiStruct output . I don't know my method (make ∑Sum in excel) is RIGHT or WRONG? 

Best Regard

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