Go into your documents folder and find the hidden runes of magic file. Find your characters name who is affected and delete the file. That should fix it.
To be more precise, under runes of magic, you have a folder matching your character name, and in that folder, several files specific to that toon. The file you want to delete is savevariables.lua file, in that folder.
That said, deleting the whole folder would not be that bad either. Little in it of much consequence, besides savevariables.lua.
You will lose your character-specific settings. It is not that big a deal - most important settings are client-specific, not character specific. Still, backing up that folder is worthwhile, or just rename it to something other than your toon name.