So this is several months late but your comment helped me track down this exact issue, so thanks.
I just fixed it by completely commenting out everything in the file and downloading KSP_partvolume to configure all of the part volumes separately. Although I don't think that's exactly necessary either. KSP_partvolume is ALSO a little busted for some reason and will set all of the volumes for the BreakingGround parts to a volume of -1L, so you need to comment out or delete AddToAllParts.cfg to stop it from doing that. But after I did that it seems like everything is working properly.