Sounds like some thieve(s) tried to use already promoting profiles to submit their own wallet to basically steal some of the bounty payouts? Shouldn't that be easy to handle? In case of such "intentionally submitted multiple entries" the profile owner should be contacted to verify the wallet ID. Then filter out the submissions that don't match.


/edit

Just checked the possibilities here on bitcointalk.org. The profile offers an option to add "Other contact info". Participants could be required to add an entry "ITNS " there. Then you would just grab the wallet id from there and only ask for the profile ID via the form. All problems with fake entries solved, since only the profile owner can submit a wallet id that way. See my profile how this could look like.  (Oh... maybe send some ITNS my way while you're at it! I could need some coins! I'm sadly still newbie and can't qualify.  )