My co-leader kicked our weakest member after the war started, and their town hall is still on the wars map (they were inactive) so I'm not sure if they will remain for the remainder of the war even though they are no longer in our clan.
There are known bugs with the clan wars system though, other people are experiencing weird stuff like what the OP said. Supercell is currently working on it. Its a complex matchmaking system, some flaws are expected. Everything will be ironed out in due time.




