Cloth scaling glitch

Hello,
I’m trying to make a cloth for a physical Curtain BP, with skeletal mesh. I followed step by step tutorial to create the skeletal mesh, paint the influence, etc.
It works while the scale is 1.0, but I wish to be able to rescale my curtain in the editor if needed, but the collision simulation goes crazy when I change the scale.
Any idea how I can fix this?

Here is a video of the glitch while running the simulation (scale 1.00 on the left and 0.80 on the right) :

Thank you
Tjommas