So i played War Zone yesterday i was at rank 78 today it updated the game and i’m at level 55. It says in the barracks my Career level is at 78 i’ve never done a career i just play the free War Zone? i did delete both folders in AppData launched the game and still at Rank 55.
Thank You.
the way COD:MW works is at the end of a season they reset every person back to level 55, they reset you back to 55 instead of 0 so you dont lose any of the things you have unlocked but it gives you something to work towards every season
i also forgot to mention that the career level is just there to show you how many ranks you have complete since you got the game 
Thank you very much.