Originally Posted by
mxz
Some times the multiple builds are a display glitch. Only way to know for sure is to have someone else find them in their RL or mafia.
The stacked buildings is a result of support reinstating people's hoods after they ragequit (and sell all their buildings). In order: ask them to move their buildings. If they don't - notify their syndicate leader. If the syndicate leader refuses to rectify the situation go ahead and tattle to support and they can delete/move (or ban the dude).