Hi all I’m new to taxidermy. I’ve done 3 mule deer, 1 whitetail, 1 Pronghorn. I was in the process of rehydrating another mule deer cape and both ears were almost shredding as I was removing the cartilage to put ear liners in. It was the back side of the ears not the thin inner ear. I’ve never had that happen before. It was like the ears were paper thin and after rehydrating then they almost felt mushy too. Cape was tanned by Moyle Mink Tannery. Any reasons why they did this would be greatly appreciated.