Trial roulette projected queue times

Something I've noticed since patch 5.1 went live is that the displayed Trial Roulette queue times for DPS are a bit wonky. I will queue for it and it tells me the average wait time is more 30 minutes, but it will pop within 1 minute at most.

There's either something wrong with the average wait time calculation or something about the queueing process itself is wrong and I'm bypassing it somehow. I'm definitely not complaining at the fast queue time, but it seems strange that the projected queue time is so completely off from the time I'm actually getting.

Something is off. When Im doing expert, 50/60/70, or leveling roulette, the AIN will say Tank but I get an instant que as a healer and not a tank. And vice versa.