Can't see from the vid if it's the brass bracket that's fixed to the wall that's also moving along with the wet wall or if it's just the brass riser, that's fitted into that bracket on the wall (with the lever that fixes the adjustable height riser) hasn't had the allan key grub screw tightened properly.
Either or .... no - the vertical riser (edit) shouldn't move/twist to that degree.
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