I would suggest to contact Paul on this one.
Because the "bug" mentioned by the OP in this topic which players can abuse is through different way and you are having bug different way.
Seems like 2 different bugs to me. The first bug can be abused by the player on his own will while you are having complete different bug.
I think it would be wise to disable this K/D on "All" ET servers until the bugs are fixed and go back to regular rating time being. But it's up to the Paul.