Missions create locations, but they don't turn up immediately
As you know, having designed it, the temple gives you the coordinates of where you need to go. However, it is a bit of a hit or miss thing when you arrive where you are supposed to fight the monsters. For example, I had the coordinates exactly right to go into a pentacle to fight some demons but had to stomp over the same spot four or five times making circles before it showed up.
I think it's a cache issue.