This happened to me too!
I just built my C&C over the weekend and my three boars had previously lived in a small pet store cage. It baffled my dad, but I already knew that they were bickering over who'd be the dominant one.
They're still rumbling a lot, but for the most part I've think they've got it out of their system. I also added 15+ minutes to their to wear out some of that extra energy!
