Adventurer in Need Bugged???

[Edax]

I enjoy queuing up as the adventurer in need for my daily roulettes and has anyone noticed it behaving strangely?

For example, when the adventurer in need is a tank it takes several minutes for the queue to pop for me. If I cancel the queue and requeue as a healer it pops instantly. Is this intentional game design, or is the adventurer in need bugged? How exactly does the adventurer in need bonus function why does it sometimes give bonuses to the less needed jobs?

I remember when 5.0 dropped, DPS in need happened a lot, but it still took me 45 minutes to get through the queue. I suspect because many players were trying out Gunbreaker that it caused there to be too many tanks in queue.