It depends on what you may be doing that could be causing this...

Did you use the BP both at night and the next morning? Because during the first week it's only supposed to be used once a day. Maybe it's from jumping in too fast?

Are you washing in-between the recommended 10-12 hour time period and starting with only half a pump of BP?

Are you using enough moisturizer and waiting until the BP is completely soaked in?

I think of the BP in terms of a "serum" because of the way it would be applied as part of any skincare regimen. Serums can pill up as well if they're not completely dry before moisturizing, if you're not using enough moisturizer on top of them (especially in this case), or if your not gentle when rubbing the moisturizer in.

But hey, it's happened to me every once in awhile, too. Leave-on topicals need some TLC when applying anything on top, in my opinion.