Skin won't change

One day I accidentally deleted the picture I was using for my skin my my photos. It made my skin Steve and when I clicked the clouse hanger to change my skin mine craft would crash
so I re downloaded my skin from my skin app and it was fine

Until one day my skin started acting up again doing the same thing so I assumed I accidentally deleted it again so I re downloaded my skin and it didn't fix anything I re downloaded it over and over and over again every version of my skin but nothing is working at all please help me!