Hopefully fixed for the next release. The bubbles should now have an owner and fluid type associated with each one.
I had to overhaul the cum bubble items a bit, but they should now be more unique when they are created. I would recommend using/dropping any old cum bubbles before collecting new ones (specifically the ones obtained in combat--new ones were merging into the old ones for some reason, non-combat ones seem to be collected just fine though, at least from my tests).