The leaderboards will REMOVE your high score and replace it with the newest score you have. Also, co op survival/campaign scoring is messed up. One of us will get half the score of the other, whether its based on who placed the defenses or who stays in the defenses while the other builds, it creates a very undesirable reason to play co op for score if one person gets half the score of the other. I also notice the person that isnt host shows inaccurate top score at the end.