Could it have been over-stuffed? Was it snug fitting around the legs? How long was he in it? Sounds like a lot of stuffing for a normal wetter
. I use BBSS with my heavy wetter & dependant on how much he's drank, can get up to 3hours by which time he's often damp around the legs. When he's leaked, the insert is often soaked though but sometimes dry towards the back of it.