Soaked the liners that I replaced today and the one that was where we were having the issue with smell and smushed poop turned the water quite dark after about an hour so soaked it again in clean water for another hour. Will do the same with the second set when I switch them.
I may have mentioned I used cotton diapers for my two kids when they were babies. In the old days, one could purchase the kind that had to be folded (thinner, so they washed more thoroughly) or a more thickly layered one that did not have to be folded. I used the thin ones which I thought washed more thoroughly and dried more quickly. Also, the newer machines use less water so it can be harder to clean thick items. The washer I used years ago, used tons of water (top loader).
Our washer is a top loader and I set the rinse level to high.
Will see if the soaking helps but that may be the issue, maybe it is too good and soaking up the pee that it takes a bit of a soak to get it to let it go again.
So far the liners have been great as far as keeping everyone dry and smooshed poop free.
Will maybe see about getting a few potty pads as well to see if that helps
Since stopping them from being able to sit and sleep in the pockets with their pee and poop (even though we spot clean 3-4 times a day and change them out for clean ones every 2-3 days) we have seen a noticeable improvement in Nala's breathing.
If it all works out we may cut the pockets of completely rather than turning them inside out so they are under the liner and not accessible
Just adding the info here in case it helps anyone out in future.