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I get that too on a Tekkit server the uncle of a friend has. My guess is that once your map gets big enough mob spawns just.. Spread thin? I'm not sure how vanilla mob spawning works, but isn't there a limit on how many mobs are allowed to be spawned in at once?
Each individual mod in a pack is organized in its own .jar file within the Wanderlust Reloaded folder. What you want to do is:
1) Download Wanderlust Reloaded v1.2.3 if you haven't already. Allow it to crash on launch, or kill it early with the console. Doesn't really matter.
2) Go back to the...