Sorry for the wait, I figured out what was going on.
Early on when I started working on this pack, Bokeh originally was only going to move in one dimension, so speed was expressed as a float originally. Before I released, I made speed an expression of vec2 so that it could have two dimensional speed. I completely forgot that I did that, so I even included in the instructions to make it a float.
I've updated the templates to use the correct ones. You can replace your MVNRomFXTemplates.rpy and it should straighten it out.