Problem with dynamic hair

Hi There,

i have a problem with my mesh and the dynamic hair.

As soon as i activate dynamic hair and play the animation, the hair doesnt stay in the default position, and gets very messy. When i put the same hair settings on the base cube mesh its behavior seems correct.

First picture is on frame 1 and second on frame 2.


i tryed to reset the mesh as much as possible ( sorted / removed all modifier, shape keys

rescaled it, remove parts of the mesh , make normals consitent etc. )

The next image shows 2 triangles from the original mesh and the behavior stays the same

i searched for some time now and i couldnt find a solutiuon for my problem