This has happened to me to. When I was actually winning a game I was 10 blocks in the air, and died -.- I thought it was lag, but now this changes everything. I can probably record a game of this happening. Also I'm unaware if this is a glitch, or not but you can't move your head while in deathmatch, which creates problems, and the timer does not go off correctly during deathmatch. As soon as you start it says '10 seconds remaining for death match, then that's it. The only way to know is moving rapidly, or moving your head constantly.
That is intended. While maybe not the best way to have it, it is intended. Although I have no idea why.
Looks to be a Y coord issue. I still have to setup my test server again. Once I have it running, I'll be able to test my theories.
I can volunteer to help testing SG bugs, as I have done in the past. Just shoot me a pm if you ever want me to hop on, 99.9% chance i'll be able to get on within 5 mins.