I can’t spot it in your screenshots, so I assume this to be the cause:
I think “Play Animation” replaces the Animation Class (your Animation Blueproint) with the animation. But if you just call “stop animation”, it will do exactly that: stop the animation. It will however not re-add your animation blueprint. This is why the mesh is afterwards in its refpose. To get your animation blueprint back in you have to add it yourself.
I can’t be entirely sure though, as you don’t show what your “stop animation” function actually does.
A more appropriate way of handling that would be to handle the states(moving, walking, lying down, etc.) in your animation blueprint, and handle one-off animations(standing up, laying down, etc.) as AnimMontages.
I hope this helps!