I got Nether Nikolite recently from a Nether Meteor. Now, far be it for me to say "FIX IT! YOUR MOD IS ACTING CRAZY!", but it seems to be spawning Nether Ores pretty much willy nilly, with no regards to whether or not those ores would actually spawn.
The Nether Ores mod has a metric assload of ores. For example, it has some ores from Red Power 2(such as that blue junk I always used for EMC Fodder for EE2), which really should be removed by now. Not your fault the dev(s) of that mod are mucking about on this mod with old code that hasn't been relevant for long enough that Elloram might as well be declared Legally Dead(sorry if this offends anyone, its a joke).
But the Nether Ores mod kind of is a special case, as evident by the fact that it still has ores for Red Power 2. You might want to tap into PC Core to check if it's actually using those ores(there is a way it knows if it needs them that as a non-coder I can only assume is nothing but black magic), which would cut down on the whole "Why do I have all this Nether Nikolite outside the ruins of my garden?" some people may be suffering from(such as myself, but only insofar as I have some Nether Nikolite with neither EE2 to use it with or RP2 to get the dust from).