The root cause of the scoreboard malfunctioning after killing someone has been found and fixed. For example, errors like "I entered 4v4, the score increased, but the bot didn't decrease" have been fixed.
The ranking issue in the scoreboard has been fixed.
The incorrect calculation of team scores has been fixed.
When a TeamNone player left, a TeamNone bot was spawned: it was always written on the blue side of the scoreboard, and the kill was written to "the viewing client's team". This has been prevented.
In the new round, player scores were reset, but bot scores were carried over; now they are reset.
The kill feed/scoreboard overlap issue shown in the screenshot has been resolved: the kill feed is hidden while the scoreboard is open.