Problems whit bones that are simulatin physics.

[Manobay]

I am making a character whit ears and a tail to experiment. so i can learn more Unreal engine. But I am having a small issue. I want to make the bones and the tail be affected by physics. But when i make the bone to be affected by the physics This append:

I am very confused because In every single tutorial people dont mention anything like this could happend. But I also know I am not the Only person who is having this issue. So what ist going on and how do i fix it???

(This is how the model should looks like, I deactivated riggidbody for this,)

[Manobay]

-UPDATE

I got the physics working, I had to simulate then Using the (Build script function)

But I have another problem now,

One of the Ear bones

Its giving me problems When i simulate physics normally everything works Just fine.

But if i set the head to Kinematic the body changes position.

Why is this happening. Does anybody know how to fix this??

-note, The had bone its not simulatin physics.