Skin pack issue

So when I installed a skin pack and chose a skin then pressed equip, when i exit the page it just turns into a random one for no reason. I'm sure I havn't messed up any of the code in the pack and even packs downloaded from the internet have this issue. I run an SMP server called pigeoncraft and i frequently need to change skins and it's just so inconvenient to browse your photos for every skin you wanted to change. This issue have been present since 1.16.