Ah, I see... I'm surprised that it's even possible to set a combo to an invalid CSet. (You certainly can't bring them up in the editor.)
Looking at the combos again, I can see how that they're set up incorrectly. I think this is because I counted the number of times I pressed plus or minus and set the adjusted CSet accordingly. I used to do this because whenever I manually entered the difference; there were times when the combo editor would shift the numbers after it was edited. (Probably because it fell outside of some unstated internal boundary amounts.)
Thanks for clearing this up! It's been bugging me for a while and I know of a few other instances where it's occured that I may be able to correct now.