Customs no longer in Favorite List

[MarshmallowHope]

I was looking up some cards made by artists and looking to see if they have been made in dueling book and saving them to my favorite list if they are already made so I can more easily search them later, but when I checked up on my favorite list all the custom cards were gone. I even tried saving my own custom cards and it said they were saved onto my favorite list but when I checked they weren’t there. is anyone else having this problem?