I recently made some custom icons for my top sites: uploaded them online, added the custom image url and they looked great. But they don't seem to be working anymore, I only had them for a couple of days and can't think of anything I might've done for that to change.

I can add a different image url and it shows up, in fact, I set the icons both in Linux and Windows and they still show up in Windows. I attached a before and after, what's going on? Thanks in advance