I sent an email to support since this was a personal case rather than a general one, as in, I don't think it has hit anybody else recently, but they told me to write in here as well, so...
Customer response on 09/04/2023 09:44 PM
So, I was checking my achievements and never noticed that the game didn't recognize my achievements properly. As you can tell in the screenshots, I have both a Nightblade and a Sorcerer in level 50 (for some years now) and the funny thing is that it counted for my Dragon Knight, but she was my 4th character to become 50!
Edited by Sailor_Palutena on September 6, 2023 9:55PM