I have been encountering the same issue. My theory is that the unit is too far out of the water, and the higher pressure puts too much tension on the filter paper and causes it to crease. I’m waiting on the plumbing parts necessary to lower it (I hard-plumbed mine).
If possible, try lowering yours?
EcoTech is the US support contact for these, and they have been great to work with in my experience. You could consider submitting a support ticket.