Darknight9797

Hello all this was an issue that I had come up in a men’s league 18+ baseball game. The league follows MLB rules. There was a pitcher who would come completely set off the rubber. They would then step onto the rubber and pitch. Is it illegal to come set and simulate a pitching position while off the rubber? I was under the impression that this would be considered a false set and a deception of any baserunners which would be a balk. Thank you for any responses!