# Particle System - Hair: size jittering - messes up scene

I have a project where I rendered out one animation. Now I see that the palms in my animation jitter in size.

Video here: https://youtu.be/JowtxnaBUZg

When I examine this effect in Blender I see that it actually is happening and not just an artifact.

So somehow the height of my particle system is being "animated" and I would like to shut it off.

What have I tried:

• Looking through all particle settings (I might miss something though)
• Looked into Dope Sheet but nothing is in there.