I don't know what happens when it gets to 50 and there is already an image with that number. But that must be happening now because you still would have had 47, 48, and 49.
Maybe it just gets overwritten with the new image or maybe it gets renumbered like when you force an extra full image for the same day.
But I wouldn't bother trying to restore an image just to get the number back in a correct sequence. As long as the images are being made and verify as good I would just keep going and see what happens.
I might make a copy of image 053 into another location for a while as an extra backup but I don't think the numbers matter much at this point.
I seem to recall the numbers on mine getting messed up for a while.
You posed this topic in the wrong section, once it's moved into the Ghost section more people will see it and be able to comment on it. But being a weekend after thanksgiving it may not get moved until monday.
Dave