If you equip a transformation from the crown shop before going into the ghost Avalon dungeon (and have already completed it for your main quest line) and once inside unequip your purchased transformation, your gamma transformation will be removed but only on the client side, in its place your character will slide around with no walking animation. This will not reset back to the gamma transformation until you load into another area (i.e. the fight with sir Malory in that dungeon)
What I think is happening is the transformation that is given to players who have already completed the dungeon is tied to the dungeon itself and cannot technically be removed but the game client when asked to remove the transformation on top of it also thinks it should remove the gamma transformation as well.
Not sure why its only client side, that I'm stumped on
pretty in depth for something light like this but I assume this glitch can be achieved with other story based transformations.