Melee's help me out

[Rongway]

Duty Roulettes automatically match 1 melee and 1 ranged in a light party (unless someone queued as a pre-made, that's the only reason you'd have ie. 2 DRG in a dungeon).

Only High-End Duty finder (Raid Finder) preserves role boundaries. I'm still reviewing patch notes to verify but I'm certain this is true. It's absolutely possible to end up with two of the same job in a light party roulette even when people queue separately. I've been in 2xPCT parties plenty of times in both DR:Expert and DR:Leveling.

[Jeeqbit]

I've been in 2xPCT parties plenty of times in both DR:Expert and DR:Leveling.

Same, but it's very rare so I tend to assume it was due to being matched with premades.