I have had the same thing happen a few times, so here is my 2 cents..
Firstly they wont explode, no matter how many times I have tried to make one blow up, it wont. Secondly, I have left a smack pack activated in the refrigerator for over 2 weks and still had the batch start, not that I recommend it..
I would contact the company and see if they will replace the popped packages and if not then store them in the fridge until you need them.
best of luck!