Pumping question

I notice, more often than not, that while im pumping, the milk tends to pool right below my nipple instead of the "shooting stream" that i see other times. The pool eventually makes its way down into the bottle, but im wondering if this is normal or maybe i should try a different size flanges? I am messaging as well as manually squeezing my breasts while pumping too. Also, its a double electric pump. Thanks mommies!