This is a request that pertains to an issue while running this mod with this mod: https://modrinth.com/plugin/custom-player-models

Steps to replicate:

1. Install both your mod and the link mod.
2. Create and export a custom player model with legs that disable vanilla animations. My custom model had animations for the legs.
3. Go into any world.
4. Select the custom model.
5. Glide (you can land naturally or let go of the glider)
6. Select your vanilla skin again.

The result is that the leg limbs will be pushed together, giving the appearance of standing on one central leg (the vanilla walking animation shows both legs moving back and forth).

Very easy workaround:

1. Glide again.

By gliding again, the vanilla skin's leg position is reset to the proper position.

I'm not sure if this could be an issue caused by something in the customizable players mod or if it's something in yours. I figured I'd open an issue here since yours seems to be the smaller mod and the easier of the two to investigate. I figure I'd ask to check: Is there a chance that the leg positions in your animations are not quite reset properly when you land or let go of the glider?

By no means are there any expectations for a fix, but it'd be really neat if you contacted the developer to work out a compatibility that allows custom player models to have their own gliding animation.