Actually I am facing a similar issue:
* User will receive two activation E-Mails with different Tokens
* The token in one mail does match to the one in the DB
** Mail Token = 42399c51355ac2303bfbfbd77e2b471f
** DB Token = 42399c51355ac2303bfbfbd77e2b471f
** Mail Token which doesn’t match = 59921ffd779d77ce
Both keys are not working if I copy them manually in the form.
Any other idea ?