Random Spawner Functionality

Hey,
I've been trying to get random spawns to work properly in a number of my worlds now, and it only seems to be working in one of my nether worlds (named mysticalsurvivalworld_nether)

Here's my file of one that works:
http://pastebin.com/iB6UpPnJ

Here's my file of one that does not:
http://pastebin.com/3xzXPGwx

I am using the most recent versions of MythicMobs and MythicLib

I cannot find out the problem, and if anyone could assist me in figuring out the solution I...

Random Spawner Functionality