Getting “can only post questions every 20 minutes” but did not post recently
I only have 107 reputation on Stack Overflow. Often when I try posting a question I get this error, even though it's my first question of the day (meaning I haven't posted a question for over 12 hours):
Oops! Your question couldn't be submitted because:
users with less than 125 reputation can only post questions every 20 minutes; try again later.
Why is this happening? Is it possible that a failed captcha check could cause it?