I put a brew down a few weeks ago it was morgans Australian bitter and it never bubbled once in the air lock, I wasn't worryed I just assumed the fermenter had a leak. I bottled it and now i''m drinking it and it is all good. But now I have a mexican cervaza from Brew Craft in the same fermenter same temp, and 4 hours latter it is bubbling like crazy and has been for 5 days now. dose any one know why this is??