Positive Cells Taking A Zero Value

I have a code below to only allow a number to be entered into one of 2 cells. I'm trying to do conditional formatting based on these to cells, and the evidence is showing that even when I type a value into either I21 or I22, they are taking on a value of zero.

I have conditional formatting stating that if I21>0, then do one thing. And in a separate cell, I have =I22>0, then do another thing. Neither works, and even using =I22<>0, then do formatting, and it doesn't work, telling me that the assumed value is always zero.