I've noticed that even on listen servers, the scoreboard will show wrong damage numbers as well, like destroying a 20k health tank with only 19,500 something damage, for example.

I figure it has something to do with client prediction.

Probably the way the server relays info to the client or something. Ask sigsev or Hydrogen maybe.

BTW, this is final mission scoreboard, right? Seems like damage scores tend to vary by up to 1000 between players. My scoreboard says I got just over 90,000 damage. One time when I was first learning Scout, my scoreboard said 99,000 but the other players said I got over 100k.

We almost beat Wave 1. Wave 1 is probably possible with practice. I think we should've gone the "don't sap anything except Super Scouts" route.