Plugin Help Multiverse is spawning TnT underground when I generate a world!

The title explains it all. Here's some info though is you need it.

-I know its for an older version of Minecraft but lots of the plugins I have are for older versions and they work perfectly fine, so I don't think that's whats causing it...

-I'm entering the right command! /mv create Survival normal

I don't know what other info to give unfortunately. Help would be amazing! Thanks!