Submissions (OR: "Why is my sheet taking so long to get on the site?")

[Fawfulthegreat64]

A pending submission I just uploaded to the Models Resource has a red border around the icon, which none of my other pending submissions do. I can't find any context as to why the red highlight is there, is it because I used APNG format for that icon? (I know I've used that format in icons before and they've been approved so idk)