MP Cost - The Lost 3rd digit

Change your pointer to its original location, this way you'll know if it's something else that bugs. Make sure you got a valid string at that address. This is how you debug:

Code:

C3/55DE:    A0B05C      LDY #$5CB0     ; Text pointer

Also for shorter ability names, I think padding with $FF after the name up to 7 letter will erase any undesirable letter.