Actually it is a "good thing" for it to move a bit, but very slowly...it means the wet clutch pack is sticking together a bit from the oil film surface tension...and your disc brake drag outback is
slight. I would almost bet that if you pull in the clutch lever, hold for about 5 seconds...start the bike and still holding it in, the engine vibes will jar the discs inside the pack free and the rotation will stop in about 15 seconds or so. That is why when you now put the bike in gear the loud clunk will not be as pronounced either (along with BUBBIE's clutch adjustment method).