This looks like the button was not removed corectly and as we have persistance in place just the button not the whole sighn get replaced on every restart ... bc sign is wats gets detected and saved for next restart . If it was ot removed correctly . This wil start happening . Ent kill all those buttons . Unload plugin delete data file and reload plugin. Should fix this issue .... now i want to add a work around is doen to make sure button is vissible on sigh so we can parent it and have to do a hacky way to remove button with sign . So some times button stays behind. Just take note of it and delete it .