Hey Seveer,
I am going to be forwarding your information on to Quality Assurance, but can you file a Support Ticket as well? This will help us track your issue specifically in addition to addressing the bug causing it in general.
https://en.support.guildwars2.com/
Additionally, can you access your map to use a waypoint, the WvW panel [B] to go to one of the WvW maps, or the PvP panel to “Go to the Heart of the Mists”? If that doesn’t work, try hanging out on the map for a while to see if it eventually kicks you back to the PvP Lobby.
Thanks!
Peter