Particle objects grow during animation - why?


I think this is an animation problem, so I posted here, If it is wrong, please move the topic :slight_smile:

Now, my little bird is in the walking animation and I pasted a particle system with alpha planes. I inserted a collision mesh and enabled hair dynamics. The feathers move during animation, but now the problem:

A few of them start to grow during the movement and they grow and grow and grow. Not all of them, but a few. I don’t know why, everyone got a solution?

Big Thx @ anyone who can help :slight_smile: