cant get forms to calculate properly the values are off

i have created form calculates sub total , use sub total percentages such profit , on head , when add these 3 never correct.  if go calculation of field , re choose independent items works once.  change teh vales of teh fields change teh sub total , calculations off again.

please help.

have checked calculation order of form?

 

look under "more" option while in prepare form tool.

 

one can place calculations, modified change in position, in 1 field in order needed form.

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