I received a mail from pentax forum with a link:
Monthly Contest Nominations - PentaxForums.com with this text on top
Quote: July "Hot and Cold" Photo Contest Nominations
We have recently switched over to a different judging format for our monthly photo contests, due to a consistently-high number of entries each month. Rather than voting on all photos at once, our members will have two weeks to nominate photos to be finalists by commenting on them.
Click on any thumbnail below to comment on a submission. Your comment will count as a nomination.
Remember that this month's contest theme is Hot and Cold; only nominate a photo if you think it follows the theme.
As it said may comment count as nomination, as used the "I nominate this photo"... But obviously it was for the "Hot and Cold" phot contest !
That how I understood it ...