> It lets me through the majority of the time Maybe the system has determined that you are human and you are intentionally attempting to mess with them. Since

> It lets me through the majority of the time Maybe the system has determined that you are human and you are intentionally attempting to mess with them. Since the primary goal of CAPTCHA (confirm that you are human) has been fulfilled and you appear to not be a good source for the secondary goal (crowdsource training data), the system decided to not waste any more time with you.