In C1, there is this formula "=A1+A9+A17+A25....." and the cell displays a big zero. I can see that A1 is 3240. So is A9, A17, A25, etc. In D1, I enter this formula "=A1" and the result is another zero. If I copy A1 and paste to E1, the result is 3240. If I enter "=E1" in F1, the result is 0...