Take a look at this screenshot: The numbers don't add up.
- Round score shows almost 12k points. It seems to the sum of this and the previous round for some reason.
- Bar increase equates to around 5k points, which might be the actual round points. Total points shown are around 12k.
- Profile shows actual score equating to like 19k points.
The scoreboard has had bugs like this from the beginning. It seems to be related to a match running for more than just one round.
I also believe (absolutely not sure, but it's a suspicion) that his leads to missing out on tokens and cosmetics.