Something that Slick and Ray brought up today whilst playing on the server. To be honest its the first I have heard of it but looks like other people are having the same issue as per this thread (that Ray found) on the Ea forums.
https://forums.battlefield.com/en-us/discussion/147178/negative-score
Also i and glyn found this black screen at end of match. Me and slick was getting this also. https://www.reddit.com/r/battlefield_live/comments/8uavbx/end_of_round_black_screen_64p_operations/
So are you guys still having this problem? if not - maybe it was just a temp bug with the game?
still getting it at times mate :'(
Im sure Ea will have a solution and fix for it SOON. :)
My game is all sorted now ea/dice must have sorted it i guess 8) :)