Broken custom skins

For a while now my custom skin that I edited I bit has been resetting to Steve or Alex whenever I close the app but I ignored it. until today when I decided to edit my skin today using the same editor. When I was done i put it into the skin thing and only the head showed when I was done (might be the editors fault) I tried to use a different editor and the same thing happened. I put the skin I was using before in and it was invisible. I tried with the unedited version of the skin and it was invisible. I don’t know what happened.