Calculations with increasing decimals shown

I have been working on a model that does a calculation of 5 numbers. All of these 5 numbers are calculations themselves from an earlier step. My problem lies in the fact that if i increase the amount of decimals displayed for those 5 numbers, it changes the final outcome. How is that possible?

Thanks for your help, i have been stumped all day!

Go to Tools->Options->Calculation Tab and see if "precision as displayed" is checked.