moises I think that their is a " " character in the formula which is causing the problem. Your cell formula reads:
=IF(D10<D12,9.5*6.895, IF(AND(D12<D10, D10<D14), (10.5-0.07*SQRT(D10))*6.895, IF(D10>D14, (23600/D10)*6.895, ERROR)))
If you change this to:
=IF(D10<D12,9.5*6.895, IF(AND(D12<D10,D10<D14), (10.5-0.07*SQRT(D10))*6.895, IF(D10>D14, (23600/D10)*6.895, ERROR)))
Notice the " " character remove in front of "D10<D14"
Now your equation will be rendered correctly.

I'll be able to fix this bug in a future release but if you could use this work around for now.

Thanks for reporting this in. I really rely on user feedback to notice these bugs so that I can improve the product in the future.