To be specific:
If I input 5 in cell A1, and input 6 in cell A2, and input =a1+a2 in
cellA3, the total is 11 for cell A3.

After I do that, let's say I change my input in cell A1 from 5 to 4. The
total in cell A3 should be 10. However, it stays at 11.
I only have this problem on my home computer, but not on my work computer.
This is driving me crazy, as it makes me lose trust in Excel's ability to
automatically update totals.