Bug Or Quirky? Spell Deletion from Spellbook

[Sulemanfredrick]

Background
I created an NPC character in Herolab (Magus(2)/Adept(1)) for Pathfinder. Then added free spells and non-free spells to the spell book.

Problem
I can delete the free spells and reselect them (there is the little "x" next to each spell), but the spell added to the book in the "Other Spell" category can't be deleted. There is no (x) next to it and I don't see any other way to access that.

It should be simple but it is not. Help would be appreciated.

Thanks in advance.