It probably posted the version I used as a wallpaper at one point, which I would have cropped the text out of. But my posting tool should have posted the source image after finding it through the reverse search it does to find the artist credit and links. Maybe I have a bug somewhere?
Edit: Hang on, I know why it didn't, the cropped file is way higher quality than the pixiv/danbooru source files. Where did I find that? Anyway that's why my posting tool used it, it determined it was the highest quality version.