Weird Profile Pic Glitch Thinger

So I tired to upload a new profile picture but after I went back to a post I had made there was A weird gray cube in the corner so I tried uploading it again and had the same problem so I uploaded a different picture and had the same problem but this time the cube appeared smaller which I think may have something to do with the new picture I uploaded being bigger so the cube appeared smaller

Can you make screenshots to actually explain this to me? It's not perfectly clear what you mean by your explanation. What I can imagine is the following: The board css uses a certain div container with a background color for the avatar picture. If your picture is transparent (actually a png or a similar file that supports transparency), it shows the defined background color as background of your avatar. If you have smaller avatar as the defined max size, the box is smaller as before. That's just my assumption though

here's the original

and here's what it looks like for me after uploading it

The box is determined by the CSS to make sure people see what dimensions an avatar has and that it isn't larger than the box' max size.