If you want us to have a fair voting, scrutinize the list and filters the names of the contestants who are in the list of those who are eligible to vote...we have so many user's who are contestants but their names appear for people who are eligible to vote
I think that will be harsh as those users may genuinely interested in competing, I also understand how this could be an issue, a contestant who can vote may not want to vote for a dish they like because their vote will take it past theirs (voting is public), but the idea should be that the selection process should mean such users will not be included to vote, so the situation solves itself, or should too.