What are you typing on? If you have a full keyboard with a number pad try typing on the number keys above the letters instead of the keypad.
The amounts are all in box 1? You are just entering 3 interest forms? You said 2 are from the same place?
If you leave off the cents the difference is exactly 180 which means you reversed some digits. I can usually figure that out but not finding it yet. I'm working on it.
