Skins reverting back to Steve

I changed Minecraft skin on my Launcher and on my profile. I had a talk with customer support. But after trying all solutions. 
My skin which I upload and use is getting reverted back to Steve one. I don't know why it is happening. It is happening since I purchased the game.
PS: I did search for this kind of issue here, but most of them were closed and solutions didn't work
Minecraft Launcher(Windows):