Bug skin Steve/Alex

Hello everyone,

I have a bug. Always when I start up my Minecraft: Bedrock Edition, my skin always becomes Steve or Alex. When I go into game with other friends they do see my skin. I also can't change my skin to another skin, because they are always Steve or Alex. I can't edit my skins and my Marketplace won't load. It's not my internet.

Does anyone know a solution for this? Minecraft, please fix this for me and others.