It's not the Carapils. You probably overprimed. Or there is a possibility that you had a contaminated bottle, or a bottle with some extra sediment in it for the CO2 bubbles to form. It happens once in a while. Try a little less priming sugar next time.
I would recommend just pouring the entire bottle into a pitcher or large glass right away, rather than taking 10 minutes to pour it slowly. Then just let it settle a bit, pour into a regular glass, and enjoy.