It happens. I'm still trying to figure out why it happens in some beers (after 200 beers). Doesn't seem to make a difference in the beer. I assume it is CO2 coming out of solution, since there is no way of introducing air into the siphon system.
I had one do it recently that had been in the fermenter for 6 weeks and had definitely finished.
Makes it a pain to get the bottles filled to the right level.
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