if we login no need captcha, but if we register we must input captcha. if login or make a post must input captcha it's very wasting time and bandwith
Clean your browser and check your internet connection if not fast sometimes captcha will not shown only that what i know.
it has nothing to do with his browser,the site in question had troubles
read more about it here:
https://bitcointalk.org/index.php?topic=1616986.100users could not login to their accounts,also the owner set cloudflare in DDOS attack mode and it makes you enter recaptcha several times before you get the money
poor OP panicked because he could not get his 500 satoshi,nothing global happened to recaptcha
just a local bot faucet attack (most likely)