The right leg of custom Minecraft slim skins is in the wrong position

So the other day I made a skin on Minecraftskins.net . It is a surprise for my cousin. I wanted see how it looked in the game. And I found this. I selected the model of the skin, and noticed that the right leg of the skin was not in the correct position. It looked really odd. And the issue applies to any slim skins, too. So I decided to check how it looked in the game, and the issue was still there. To this day, it is still not fixed. Please fix this issue, I would really appreciate it.