Try Checking the event sheets For something that has to do with that enemy and see if a Specific Event that is linked to that enemy has something to do with it. If You have the time, you can check when does the enemy "automatically" move left and when it doesn't. For example, If It is doing it ALL the time, no matter what, It might be a "Very X second" Command, "On start of layout" Command, or the "Every Tick" Command.