A short while ago, I uploaded the main (i.e., regular, non-seasonal/event) sprite for Mamiya, since I noticed we didn't have it here. While entering tags, I accidentally hit the Enter key (probably while trying to press Shift), and submitted the post well before I was done entering tags.
I dove into the edit-tags box once I was redirected to the new Danbooru post that had been created for the image, and hurriedly added in all the rest of the tags I had meant to enter, as well as correcting a typo I'd made (and belatedly noticed) in the initial list of tags. I worked quickly because I didn't want someone to click on it, see the paltry, seemingly-half-assed list of tags, and go "Wow, look at how much effort this jerk bothered sparing." Once done, I submitted the typo-correction and the rest of the tags I'd failed to add to the original upload. I wasn't happy about making those mistakes, but I'd gotten right on it and fixed it as fast as possible since I knew what needed changing.
When the post refreshed itself after I submitted, I noticed with alarm that not only had I failed to add a couple of other small details, I'd misjudged the color of her eyes and her hair bow. Argh. Feeling a bit foolish, I went into the tag-editing box once more, corrected my mistakes, added the tags I'd missed on the second go, and clicked Submit again.
On a whim, I looked at the tagging history to see if someone had made some changes in between or during the two tag editings I'd just made, hoping that I'd made them before my initial flubbing was noticed.
What greeted me was this: https://puu.sh/wKpmw/11460a1b26.png
...wat
Going by this record of events, not only did I never make changes that second time, but someone else happened to see the new post on the front page, decide to go to it, notice the lack of tags, add in the exact same set of tags that I did including the two erroneous tags, and submit it, all within one minute of the post appearing on Danbooru. And with no forewarning. While not impossible, that seems pretty unlikely.
Now, I have to assume that this is due to some bug or a one-in-a-million concurrency mishandling (like 4chan thumbnail errors, from back in the day), rather than some kind of bizarre edit-embezzling scheme. But it does look really weird, and if someone could figure out what happened, that'd be awful nice of them.
Thanks.