I have had a couple strains show this in one way or another. Some just grow a leaf there. It is not something that will add much weight or production. Who cares they are cool to look at and won't hurt in any way. I had a Jack the Ripper make a leaf bud big enough to get me high. Don't take a lot of JTR to be honest though. I will look and see if I can find a picture of it
That is weird looking with the leaves coming out of the center with the pretty bud, (Now I want to smoke mutant jack the ripper weed!)
Tried to pollinate the one on my plant to see if it will make a seed ( just because i was curious) will post more pictures if it actually makes one, but so far it looks like it isn't getting any bigger.