Got a pair of Fairbuds XL and I get the same clicking sound as reported in this post https://forum.fairphone.com/t/fairbuds-xl-clicking-sound/99448
It is highly annoying, sounds like a metal ball knocking back and forth in a small space when moving my head or walking, I was going to return them but I found out where it is coming from. It is coming from the part that allows the earcups to slightly swivel and twist and I have found that twisting the earcup fully forwards or back while putting them on stops the clicking sound. It is a little annoying that I have to do this on a £200+ pair of headphones though.