[CLIENT] Missing skins.

Hello, okay so I've been a league player from 2011. and I've been noticing now that some skins on my account are missing which is really weird. not all of them and I can't really list many but for example I'm sure I had skins for Karma, Trundle and Malphite. I didn't really check all of the skins because my memory has been failing me tbh. I don't know how to fix this but it doesn't feel right to have the skins before and not have them now. I didn't try champion select cause I won't be playing the champs anytime soon. I only checked the "Collections" > "skins" tab and they're not there. Is there any solution for this? most of them are legacy skins so....