Do u have a filter on ur lens? Coz it looks like its a reflection from a filter...
Do you remember which is the real moon in the picture?
Wha, A ghost moon arh...
Did you capture this shot with long exposure with flash on 2nd curtain sync ? hahahha joking ...
Remove the filter and try again.
The coatings of some brands of filters are more prone to ghostings/flarings.
Actually the so-called "flaw" looks like a pretty cool effect to me. *lol*
long exposure, so long that the moon moved?
I'm quite sure it's your Hoya Filter. The cheaper Hoya filter has a lot of ghosting if shooting directly at the moon. You can consider removing the UV filter for shots at the moon.
You also probably need a tripod for shots of the moon. Also, u probably need at least f8 or smaller aperture. Also, if u want to see details of the moon, you need to set your exposure based on metering on the moon itself. Anywhere else, you're gonna get a bring moon