The headphones are damaged product... I replaced it... today i received new headphones is really good... and amazing sound quality...Hey john,
Those headphones are compatible with the iphone x, because the iphone x uses bt 5.0 and the headphones are 4.1. 5.0 is backward compatible so that is not the issue.
also its really odd you use 20 dollar headphones with a 1k+ device. but they should work.