Sorry about that, it was a problem with the new Scarlet R tab. I didn’t take into consideration the fact that when both duplicated entries are in the same contest, it might not be the most recent entry that gets deleted.
Duplicate entries in the same contest happen when someone mis-posts and the link shows up as text (which the scraper will still interpret as a valid entry as long as voting is enabled) and then re-posts the same thing correctly as an image.
It should be fixed now so let me know if you see it again.