hey fellas, i put on a batch of "Australian Coopers Lager" on sunday and over the last few days i have noticed that the air lock has been bubbling as normal, i came home from work yesterday and checked it and the air lock was almost empty and it seemed like there was beer on the top on my barrel lid which had bubbled out of the fememter or may have exploded out?? im not sure wat could have happened? any ideas??