Thank you for your question.

Kinnikkinnick can be susceptible to a leaf gall that can cause these distorted leaves.  Here is some information from the Pacific Northwest Plant Disease Management Handbook - https://pnwhandbooks.org/plantdisease/host-disease/kinnikinnick-arctostaphylos-uva-ursi-leaf-gall

Please take a look at the recommended cultural controls.  You should remove and dispose of all fleshy leaves and flowers before white fungal spores appear.