How about after that first initial grab? Because I've got an 04 500R and it does the exact same thing. But only then. It's just the clutch doesn't engage properly right on the first try. I'll start it in neutral, pull the clutch and kick it into first and the bike will jump forward before the clutch grabs. It's just one of those things.
As long as it operates normally the rest of the time and doesn't slip, you're probably fine man.
Try pulling it several times instead of just once. I tried it today and it didnt kick when I grabbed first gear. If it doesn't do it after a few pulls/releases, then its definitely not an adjustment problem...cause if it is, that wouldnt affect it.