My Minecraft skins have been deleted. I've tried to get it back but they are default now.

I was opening Minecraft to see they had another Hotfix. So I loaded on the game, to realize that my skins are gone! They all were default! I as trying to open it back up right no to find out..... some of my skins were saved! But three of them still were default. I checked if my internet connection was bad, and it was good! I'm logged in to my account to! I've tried several times. Why don't I remake it? You deleted or "updated" some things I used! What type of hotfix is this?