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I think it just that the images are from two different telescopes and because they have a different view point the star appears to have moved. I only recently started noticing this with the Mosaic images seemingly at a different angle if not upside down. I had not seen Mosaic images to my knowledge before DR11 released.
Right, they may be upside down in this view, because it shows the image cutouts as they come in the image files we get.
Mosaic and 90Prime were used for the northern part of the North Galactic Cap - both telescopes (Mayall and Bok, respectively) are at Kitt Peak in Arizona.
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