bean soup help......and please hurry?

I make bean soup all the time- mostly use northern beans or navy.....tonight I put some lima beans in a large bowl to soak over night...well, they kind of soaked up the water and ...split or blew up or something. Is this normal? Like I said, I'm no amature at this, but its kinda odd. Bad beans maybe? I've only used limas a few times...I need to know now before I continue and waste the nice pork I have. Thanks