Stumped on Boxart

So I have manually added boxart for all my games. I have the images in the correct size, in PNG, and in the “Imgs” folder but one won’t show up on my miyoo. It is the fan made boxart for Unbound. I have tried two different images and it still won’t show, my other rom hacks show but for some reason Unbound does not.

Any suggestions on a fix are greatly appreciated.