I've been editing fe6 quite a bit recently, mostly with fe_builder, I've done everything from creating new classes to modifying portraits sprites, however, I've come across an issue with the in game graphic for leveling up. I looked around quite a bit, and cannot seem to find where this graphic comes from within the game, or if it's simply somehow a palette issue.
I've modified Eliwood's class and portrait here, but it happens with every character.
Edit: Caused by Fe editor, which I used once, Fix here: