Now Viewing: READ THIS FIRST! The (un)official Faq
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We will always keep the highest-quality, newest version regardless of any other factors. Quality and time are literally the only factors that go into determining which version to keep. Score does not play into this at all.
The lowest-scored version happens to have been uploaded first, so it's the one we will keep.
Danbooru and Gelbooru used to have a tag for images that do things like this. Sometimes the things are even browser specific. Usually only working on Internet Explorer.
This one seems to work on all of them. Its a fun thing. I guess in this case its a resolution thing.