Looks to me like the one has just been moved from original spot for some reason. It's supposed to mount on the door, if you look closely you'll see where it is supposed to mount up. Only thing I can figure is either someone didn't know what they were doing or they moved it off the door to the tub like that to have mirrors while driving doorless. But all you gotta do is mount it back on the door in its proper position.
All they did was move the driver side mirror to the body side of the hinge. That way when the door comes off the mirror stays. Looks a bit funky but many states require a rear view plus one side mount mirror.
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