Hey Snake Doctor,
I've replied to your PM, so please make sure to check your inbox.
In short, it was likely a Rock the Vote triggered by players, as no admin present during that game used the force change map command (nothing in the logs, and I talked to the admin).
Admins do not force change map (especially during a full server) without first asking players. Or sometimes because there are plugins/map/server issues that require a map change to refresh, but usually I'm the one that do it and I announce it via console.