Sylvari gravity issues
It’s a bug that only happens once in a blue moon to a character. It’s not specific to Sylvari. It usually clears itself up in a short time, but you can always try a -repair of the client, if it persists.
Good luck.
It actually happens quite alot and its not race specific (gravity is an equal opportunity troller). The character starts to adjust to the plane angle of the polygon they are standing on, which result in quite funny things.
It would be curious to know if this is a purely unintented bug (its been in the game since release AFAIK) or if its actually an uncompleted feature that was never fully implemented due to… obvious… issues, so Anet just said kitten it we disable character leaning. Come on Gaile, poke one of the programmers we know they can post :p