The spawn protection will only get disabled once the player change weapon or after 5 sec passed. It's already stated in Script Changelog topic, so i dont see any bug here. Anyway, i have done some changes to make server disable it after player move. However, due to player's lag and teleport problem it might not work as it should some time, i have not fully tested it yet though. I dont have much time due to personal matter, you may report bug at Bug Report section instead.
The dark grey color means the player is being protected by server( immunity - whether it's spawn protection or admin using Duty Mode ). You are not supposed to kill player that's being protected by server.