Capes are sometimes not properly saved in the skin servers, resulting in them being unequipped

I was using lunar but after I closed it and restarted it my cape started to disappear. I went online and also minecraft launcher. I clearly pressed equip but after I started the game it was gone. I closed the launcher and then opened the launcher and checked and found that I had clearly pressed equip but the cape was gone again.  Sorry for my bad english I hope u guys can understand ...        tq so much