It only seems to snag pics as dupes if they're identical in size (and maybe file type, but I'm unsure on that one), so larger versions usually tend to queue up without problems
I've uploaded a few images that i later saw got approved by another uploader. My speculation is that i saved a pic from DA or FA, and they the counterpart
That would make sense. Also, I wonder if it would be possible to handle these dupes by merging their tags so it would be easier to find them, I suppose.
Now that I became a moderator, I was going to go see the original post here. I can't seem to find it with the tags "thunderafterdark" or "chizuko" though. I wonder if I can't find it or it was just moved because this is here now.