Campaign final score bug?

I keep getting minus score on every ‘Normal’ campaign mission that I’ve played since the ‘Advanced’ campaign option was added, thing is, it still gives me a silver or gold medal on a really low score. So I’m assuming this is a bug, but i haven’t seen any confirmation on this. Any information would be appreciated.

I’ve had similar issues which the score at the mission complete would be completely different from the score i’d see in the more broken down results page. It just so happen to be one of my best scores but nope!, got that negative score…

It happened maybe twice though, back to back.

It was really strange, but i haven’t been getting any minus score’s since yesterday evening. Maybe i was having a stroke of bad luck with teams or something. Seems to be resolved for me at least. Strange.