So I usually use custom skins, one that I made on a drawing app, when I play. I like to use asymmetrical skins, so usually one side will look different than the other. I use this app called Medibang to make my skins, and for the past almost year or so these skins have worked perfectly fine. I made a new skin a few days ago and was excited to use it. I made it asymmetrical as usual. However, when I applied it to my character, the leg textures was copied from one side to the other. To be more specific, one leg is supposed to have a red fishnet tights sort of thing, while the other leg doesn't. However, on the character, both legs have the tights. In addition, I also put two different leveled socks on the skin, but since the legs have the same skin texture but kept the overlayer texture, one sock appears two have two edges, if that makes sense.

This glitch only seems to happen in the game itself, as I have used skinseed to view the skin on an Alex model, and it looked just fine. As you can see in the attachment below, the legs work fine on a Steve model, but not on an alex model. 

Also. other asymmetrical skins appear to work, as seen in the other attachment below(the girl in blue). Something to note, I used this blue skin as a guide for making the red one, so I don't believe there's anything wrong with the skin file, although I have been using the blue one for a few updates now, so maybe the problem lies within the latest update?

If anyone has any suggestions, I'd like to hear them and thank you for the help.