Quixel Foliage looks like waterfall

Not sure why no reply. Possibly because this has been asked a few times.
I believe it is a bug with PCG.

You are using PCG and pivot painter versions of these models. Swap the picot painter ones out for simple wind when using PCG.

I have no idea if there is a fix for it curently. Other than disabling the wind or using the simple wind versions.