Yeah that happened a lot because of a spectator issue. Whenever someone died (not when someone attacked and/or killed them but when they fell off) they would become a spectator. They could kill other people and not be killed and not be able to win the game since they died or break/place blocks. @KvixSi that also happened for some people as a glitch. I think both were fixed thoughTo say, I haven't had that bug, i just had the bug where people die and they come back and kill u.
plus the spawn for skywars said that it still has bugs and the owners are working on it to fix it. you should be expecting this stiff
be patient guys.