A bunch of grey thumbnails in my iCloud photos album that I'm not able to delete. Help?

I have a bunch of grey thumbnails in the albums section of my iCloud photos, but my library is empty. When I go to delete the thumbnails, it says "unable to remove item, try again later". I have iCloud photos turned off and I have for a while. I have selected to delete and photos backup and am in the 30 day period before they are permanently deleted. Just confused on why I have a bunch of grey thumbnails that I can't delete.