Anime library cover keeps getting half blacked out

[Yamus]

I'm not sure why, but the cover to my anime library keeps getting half covered by a black box after a while (see attached). If I right-click, then "Edit Images" and delete the Primary image, it fixes it, but after a while it ends up with the black box again. None of my other libraries do this, so I'm at a loss.  If anyone has experienced this, or has an idea of how to stop it, I would greatly appreciate it.