Why do I have negative AP?

This issue is the result of a former bug we fixed a few months ago. Characters who haven't played before 2017 shouldn't have faced this.

Basically a bug in the past allowed players to buy skills without being charged for them. The fix basically charged the skills (and let players keep it) which sent player's AP in negative territory.

In a sense, that's almost as if the player bought something with a credit card and have to pay it back.