Inconsistent Calculations Depending on Device With My Form

I designed a form that works perfectly on my computer, but my client, who I designed the form for, gets fields that don't calculate as they do on my originating windows 10 desktop. I don't have a clue where to start to troubleshoot this other than thinking that trying to do this in the first place was a mistake if everyone who gets the form will encounter different results. 

I also tried opening on my iPhone. Got inconsistent results there. The main issue is...this is a create budget form where when you fill in category amounts, they automatically add up in fields that calculate total income, total expenses, and subtract expenses from income for a total. https://acrobat.adobe.com/link/review?uri=urn:aaid:scds:US:4b9f1468-ad31-31c8-8279-b762047b71e0 

As I said, on my desktop these calculations work fine, but they are not calculating on my clients laptop or my iPhone. By the way, I use the adobe program on my phone, but again some fields seem to add up and some not. Inconsistent results. 

Does anyone have a suggestion other than removing the calculations?