Two questions about WvW queue
You’re right it is buggy. From my experience and what I have read you may have better luck queuing from a non-overflow zone. If you get prompted to switch from overflow you probably want to requeue. Also, helps to relog before queueing. And if you’re waiting more than 20 minutes then relog and requeue.
There are more questions than answers on WvWvW queuing, especially since they don’t give a time or player count estimate.