Alex Skin Pack Leg Bug

When I try to use my skin packs in Minecraft, it seems like the left leg is flipped. It doesn't happen when I import a singular custom skin using the "import" tab, but only on skin packs. This seems to affect even some of the skin packs from the Minecraft store. Down below I've attached screenshots of how the skins look when I made them vs. when I use them in my custom skin packs in game.