The program put it in because your plan has an unconnected room.  Your solution is not really a very good solution.   I recommend that you always leave "Connect Island Rooms" turned on.  The program puts them in because having unconnected island rooms can cause a multitude of problems with room definitions which can affect things like living area calculations, floors and ceilings, room moldings, etc.   If you don't like where the program puts them, then you can just move them
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