Problems with the Launcher Skins

Hi, I'm having problems with the Launcher skins, it's something that started to happen to me two days ago, that from time to time my skin changes to a skin that I haven't added by putting on random skins, I thought it was a hack and It turned out not to be that, I changed the password and nothing, it was still the same, I reinstalled the Launcher and it wasn't the same either, I really don't know what to do and it's something quite annoying to have the skin that I use and that from one moment to another server or I disconnected and logged in again and have a different skin that I have not put, because they are also skins that I have not added to the library, so I don't know if they can give me any solution