Invisible Wall Problem, what is causing this?

Hello -

Running a simulation in Embergen of very fast flowing wind.

There appear to be kind of invisible walls and glitchy areas within the simulation. It’s almost impossilbe to explain without motion, so I made a screen recording. I imagine there will be a simple explanation for the problem, but I can’t figure it out.

VIDEO: SeekingHelp - YouTube
PROJECT: Dropbox - Source for help.zip - Simplify your life

What is causing these? They make the simulation basically useless, so I have to figure this out to proceed. Otherwise, really enjoying Embergen.

Thank you so much in advance.