Velo Plus Half-Crammed

It’s hard to explain what it’s like, but for all of the Velo Plus pouches that i’ve used so far (like 30) every single one has one side that is like super packed. Like half of the pouch is super stiff. I can squeeze it to unpack it and evenly distribute the filling. Why are they like this? Is there a reason? Does anyone know what I’m talking about? How can I explain this better?