Since 3 days now, the both accounts I use have the same skin whereas they are not configured this way. Also, the cape I have is not displayed at all.

BUT, when I go on Multiplayer servers, all is fine, cape is on and both of the accounts have their skin on. This only occurs in Solo and LAN games, which is quite unconvenient.

I don't know how to reproduce this..? It may have happened when I've tried to launch the game with one account and just after, launched the game with the other, but the first one hasn't finished starting..? Since then I can't play with the wanted skins, capes, ...

I tried to reinstall Minecraft completely... Same for the launcher.
I tried to reset my skins 10+ times.

Nothing works.

(The first picture is in a Solo (LAN) game, and the second is on a Multiplayer server)