Probably a player has marked their turn temporary. If a player is not done with their turn, but wants to already upload it "just in case", they can mark it temporary: there's a checkbox after the upload, and a menu item on the game page. A temporary turn will now be as "(OK)" to other players.
Note that (unless the scheduled time is reached) the host will wait 30 minutes after the last turn submission to allow you to fix last-minute mistakes. But this means you'll never see the host running immediately after an upload.
