pillow talk, nasal that is

here is my problem. after i exhale, just before inhale, there is a very soft click or pop sound with accompanying with a slight short vibration. this seems to come from the pillow itself. this mostly happens on the left pillow.

it's almost as if the inner liner does a short "flap". i'm not sure how else to describe it. i have of course tried various strap positions. and i've tried the small, medium and large. this happens on all of them.

this is just enough of a problem to be annoying to me. so my question is, has this happened to other pillow users? if so, how easy is it to correct?

or is this yet another thing for me to get used to?