Multiple Fume Boxes- render artifacts (FumeFX 3.5.2)

[rconover]

I was able to make one from scratch (attached). You'll need to make a local version of the cache for
'fumeFX1'. Then get the boxes 'fumeFX2' and 'fumeFX3' to use the same result cache.
I rendered via the perspective camera and could see the issue via the UI renderview and with render batch.