I think I just found a bug in TSR.

[Alefy San]

UPDATE: Nevermind, the sheet has been approved now and the icon is normal. If that was a bug, it only happens in the pending submissions page. Or maybe this is just some way to tell you that you've updated a pending sheet... Sorry if this is common knowledge, but I don't know what that red color means, sorry. 

Oh hey, first of all, I'm not entirely sure if this is a bug or if I did something which I wasn't supposed to do.
So, I recently uploaded a sheet with a simple .png icon on TSR. But since I thought that I could improve that icon before it gets approved, I used gimp to create a simple animated .gif icon and then I edited the submission. But the problem is that for some reason the icon is surrounded by a red color now.

This is a screenshot I took:
https://drive.google.com/file/d/1i_F-yjL...share_link

The red color makes me believe that I wasn't supposed to do this, but the "Sheet Updated Sucessfully" text appeared with no warnings whatsoever, so I'm a little confused.

Something I believe that could have caused that is that maybe some frames of the .gif might contain an alpha channel and others not, but I'm not sure if that is the case.

[Petie]

The red color means that the icon is bigger than the size we’d expect for that file type. This will pretty much always be the case for animated GIFs and can be ignored.

[Alefy San]

The red color means that the icon is bigger than the size we’d expect for that file type. This will pretty much always be the case for animated GIFs and can be ignored.

Oh, I see! Thank you so much for the info. 

Just sorry for the pointless post. 
I was just a little scared that I could have "broken the site".