First, CoL is miles lower in Houston and other tier 2 cities in America - you can buy a detached house for around $500k/£400k in a posh neighborhood. Not happpening in inner ring London.

Secondly, I've noticed issues with Levels.fyi ranges outside US/Canada and top tech hubs like Tel Aviv and Bangalore. Most markets don't have the same awareness of the tool, so salaries tend to be overestimated.