Repro steps:
1. Open a catalog in grid view
2. Open second monitor in loupe view
3. While using mouse wheel to scroll through photos quickly on the second monitor loupe view, press P or X to flag / reject photos. Do this before the photo has fully loaded.
Result - incorrect or no photos are flagged.
Unfortunately I ran into this bug after culling over 5000 photos from a recent trip - thank goodness for backups but I need to now spend days culling these photos again.
Seems to also be mentioned in this discussion: Re: Keyboard Star Rating Being Applied to the Wron... - Adobe Community - 14094236
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