Entry 13 has been bugged for days. The event spawns but the tiger doesn't. The only way to get it is by resetting the event by NO ONE going within a ~1200 unit radius of the area at the end of the jumping puzzle in Diessa for 10 consecutive minutes. If someone does, the 10 min timer resets. The problem is that Diessa is so rarely visited, there's been only one instance of this map so everyone that comes in to do the JP/get the tiger den resets the 10 min timer and we're all f**ked. How has this gone so long without anyone at ANet confirming it's a bug?
We've confirmed with the public that this is a bug with all tiger fight events with the Chuka and Champawat journey last week. We're working as fast as possible to fix up these areas for everyone.