Sometimes when activating the shrine while attacking creeps and collecting their loot, the shrine activation text doesn't appear and it doesn't make a sound. This usually happens when there are many creeps dying at once and you're on top of them, collecting loot before it hits the ground.
If the shrine appears as tho' it's been activated and it's your first time near it, well.. Then, your DQ needs to slow down on the crack.
But I'll let admin Bethe judge of that.
You should try capturing a screenshot of this happening before you clear the map and just before you reach the shrine. Some might call bs.