calculated fields and totals aren't correct

Sometime I’ll get how to post this. I’ve tried 3 times. Grid with 2 nested grids. The nested grids have a subtotal of all the amounts in a column. When I manually add that column it does not match the totals line every time. Sometimes it does and sometimes it doesn’t. I saw a post in 2014 that said totals on calculated fields doesn’t always work. is this still the case.