That’s a first with the spike fermenter in the 2 years I’ve owned it. 10-11gal, Wlp037, NBA. I’ve used this same yeast 3 prior times and this didn’t happen.
That happened to me a few batches ago. It was Bry97 and it was so good it clogged the airlock and the lid unsealed. What a mess, and what a PITA to clean. LOL. My daughter told me she thought she heard a popping sound but didn’t know what it was. Well, I know now. LOL. Good luck and at least you know it is doing it’s thing.