Because we have applied to M&S and Crowdfunder before their system carries out some painful checks. You haven’t voted if you do not get a Successful Voting message !!!
When you click on the Vote For Project or Pledge and Vote
click on the X to close the sign up message
either click on Connect with Facebook. You may need to enter your Facebook login info.
or click on Sign Up
enter a sensible name; your email address; an 8+ character password; Sign Up
If you get a Successful Voting message, great
If not, their system recognises you but you cannot remember your password !!
You could request a password recovery but this is painful.
Better, try Sign Up again but alter your EMAIL slightly
eg firstname.lastname@example.org could become email@example.com or firstname.lastname@example.org