New to brewing. Brewed one batch successfully. It came out great. Conditioned nicely. Checked my second brew(a stout) after second day of fermentation and found a mess. Top was off of fermenter and the wort was everywhere. looked like during fermentation there may have been too much CO2 build up and the bubbler filled with wort and it spilled over and then the pressure build up popped the top off the fermenter. Any ideas as to why this happened? I am assuming the beer is ruined but I replaced the bubbler and I am going to let the ferment complete because the bubbler is still moving. I'll see what I get in the end. but again, why would this have happened? Contamination, ingredients, something else?????