MA's" count in chat thing" should start from 1 not 0 right ?
Also when you just join a server before you join a team, you are viewing the map from below the surface, so that could be confusing to new players.
All stats do not get modified in practice mode, pregame, or postgame. No matter how many mas you get it will always say "midair #0", and this is expected behaviour.
The other one is a known issue that is merely a mapping problem.