Oh, that is no mistake, those two cells show the source of calculation for the spells/day-calculation. Those are used in other formulas as indirect references.
But if there are no error values in the sheet on the left, everything's fine! :-)
I see the problem with hit point calculation and Forsaken characters, and encountered another problem with the Toughness trait.
The formula I used is also based on my house rule that you do not roll your hit points for each level but instead gain your maximum hit die when advancing.
AFAIK, only on the first level you gain your full hit die, but afterwards, you roll how many HP you gain.
Anyway, I'll put the whole HP-section on my "still to do" list...