Hello,
My gamertag is Devildog3659. For some reason, my Killjoy medal count and Party Pooper achievement progress are not the same. In my matchmaking count, I have 187 killjoys whereas my achievement progress shows I only have 104.
I have the same issue but not as extreme of a difference. What Halo title do you play the most? It might be related to the fact that some medals are not awarded properly from certain Halo titles.
Seems like 4 I play a lot of swat