Level 46 - 48 Hinterlands (Horde)

[Wolger]

The quest Cannibalistic Cousins
You need 30 Vilebranch Scalpers and 15 Vilebranch Soothsayers

The quest Stalking the Stalkers
You need 15 Silvermane Stalker and 15 Silvermane Howler

[Zygor]

Thanks for reporting, this will be fixed in the next update.