Thank you for the fast reply! All requested files (hopefully) here.
One more thing I thought I should add is that I feel there is very little randomness. The issues are always in the same cells, and it happens every time I generate grass cache and lod, without exception. I can't say every individual grass is in the same spot every time, but certain ones definitely are. In some cases I even hand-placed pillars and trees to hide the floating ones.
Again, thank you so much for your time and help.