The strange thing is - I encounter those cloudflare checks on multiple sites - ONLY on flyertalk.com I have to click in the box. Other websites seem to auto detect that I am a human.
I have it on all browsers on MacOS - FireFox, Edge, Safari, Chrome as well as on my iPhone in mobile Safari and mobile Chrome. It seems around 10 minutes of inactivity on Flyertalk it lets you validate again. Very, very annoying.