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I think that carnifexes can go instinctive behavior but my friends think differently. What is the actual rule?

Carnifexes do suffer from Instinctive Behavior. They have to Lurk if they fail.

Print this out: http://us.games-workshop.com/errata/assets/TyranidsFAQ.pdf

Then do the "I'm right, you're wrong" dance with the "in your face, punk" flourish.

Thank you very much for clarifying that.

I thought Carnifi were fearless...

Fearless doesn't mean what you think it means. It means immunity to Fall Back and Pinning, not to ALL Leadership tests. People forget that.

They also have 10 LD right?

Yes, so it'll be a rare instance where it comes up. But when they roll a 11 on the last turn of a Alpha Cleanse, and that Carnifex stops contesting a quarter due to Lurking, it'll matter...