4 out of 5 skin slots are unavailable.

This issue started a few days ago. I simply opened up Minecraft and when my character loaded in the main menu it was Alex. I went into the dressing room to see what was the issue. I managed to re-make my character but then I noticed I could NOT use any of the other 4 character slots to make a new one, they just kept loading and loading forever, no matter how much time I waited