11 leaves is pretty common. By the way, this is the mutation I was talking about in my other reply. This was on an ILGM Purple Haze plant I grew last year. I have another one of these plants growing outside right now that has the same mutation. Most of the leaves had 12 fingers (11 fingered leaves with one extra in the middle).
That's hilarious! I've seen your avatar a million times and never noticed yours had the same mutation. ILGM doesn't really say what the cross is, which is why I always make sure I call it "ILGM Purple Haze", because it clearly isn't actual "Purple Haze". When I bought the seeds, I bought them because I thought their site said their seeds were a cross between Haze and Purple Thai, but the seed page just says "the prevailing belief is that it comes from two parent strains, Haze and Purple Thai" (speaking about the original). So, IMO, it's more of a "mystery weed" than anything. But, whatever it is, it is really good. Amazing smell, flavor, and high.