unity trial version watermark

hi guys. I was using the trial pro version to build a game, but because the game didn t need anything from the pro version, i went back to the free version. The game is finished, but the "trial version" watermark is still there. why ? I'm using the free version and everything is working(because i didn t use anything from the pro). What i have to do ? Anyway, when i was using the pro trial that "powered by unity" didn t show, but now is there. It is normal ? As far as i understand, that image should be there just at those who have the pro version.