I'm doing his quest to get his bonemold formula. I got it, but every time I go back to Raven Rock, he's brainwashed at the Earth Stone, picking away and chanting mantras.

I got to Solsthiem without getting the note on the Cultist, so I haven't started the "Dragonborn" quest, nor do I plan to on this character. Will Glover ever leave the stone, or do I have to free him? I know most of them don't leave it, but he's not even supposed to be there.