That's pretty normal for fleece actually. Which is why pocket diapers are particularly prone to build-up and repelling. 

Unless there's a really bad build-up on the fleece liquid will pass through when it's in the diaper because of pressure from your little ones skin - doesn't take much, essentially just touching will do it. You can try it for yourself just by laying the fleece against a clean diaper (or towel, whatever...). Drip some water on it (running from the tap will probably be a little too much water at one time) and then just run your finger through the sitting water, you should see it start to go through the fleece. Even just the 'pressure' from the fabric underneath should help 'pull' the liquid through.

Worse comes to worse, even if the liquid doesn't go through very well while in the diaper, it will just run off the fleece and into the diaper and still stay pretty dry. So pee is still not likely to lay against baby's skin or anything. And as long as the liners don't entirely stick out of the diaper then it shouldn't cause leaks as the diaper will have a chance to 'catch' it first. But that's unlikely to happen anyway...

Karen.