Thanks for posting!
When was the last time you were able to properly view your ranking in the leaderboards? Have you possibly joined any type of that seemed odd, or have you been invited/accepted game invites from random players.
The last time I saw my gamer tag on the leaderboard was one week ago. I have not played call of duty for a week. I just recently came back on it and the first thing I did was check my stats on the leaderboard and all it says was, UNRANKED in the colour yellow. At this time I have not played or joined a game.
I did not accept any game invite and I have not been in a weird lobby.