You have to see which one is Nerun's and activate it. One is for an example, one is for Nerun's.
Random Encounters really isn't meant to be a "drop in distro". It's a tool for creating region based (instead of point-based) encounters on your shard, with all sorts of special rules to account for where the player is, his level, time of day, and so forth.
Nerun's was thrown in as a starter, but isn't even a particularly good example of what Random can do.
For example, Random can: see that the player is on-road, that it is twilight, pick a specific encounter for that player by shard or by region, and see that the player is too strong for mentioned encounter, and using that information, make that encounter tougher.
Another variation can see that a player is an animal trainer, and increase animal-type encounters specifically for that player.
That goes way beyond what's in the Nerun's example file.
C//