title: elusive recaptcha bug. Copy code always fails
body: <p>A very small amount of my users get a captcha that asks them to copy and paste a code, but it always fails for them - while most of the users get the normal one (checkbox) which goes through correctly.
  Googling only returned three instances of people getting that captcha none of which had any valuable information</p>
  
  <p>Any ideas as to why they're getting that captcha and most importantly why does it fail?</p>