Hey guys!
Having some problems working with grains. Any idea what's up with the "stuck" to the surface grains? Looks like they are sliding up and down and then in the end just slides off abruptly. Something is off here.
Using 10 substeps, so it's not that I believe, and for collisions I'm using volume sampling, when inspecting collision geo it looks fine/accurate as well.
What could be the problem then?

P.S. Video preview not showing up for some reason in here. So just click on "Video" bellow to view it.

Video [capture.dropbox.com]