I could not recreate your issue on my test system.
But I did enter your contest and did get the errors.
I have attached a zip file with version 1.5 file of tpl_contest_default.php that I have been working on that might have the fix you need.
Backup your existing /includes/templates/YOUR_TEMPLATE/templates/tpl_contest_default.php file.
Unzip the file and upload tpl_contest_default.php to
/includes/templates/YOUR_TEMPLATE/templates/tpl_contest_default.php replacing the original.
Depending on how you run your contest you could re-email the winner.
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