Checking the oil level on these is tricky. They need to be run for awhile to pump all the oil out of the sump and into the tank. If you just check them cold the level may look low but some of the oil might have leaked into the engine. The full mark is very close to the max as well. If you overfill it the excess will blow out of the bike like a fountain.
If it's just a tad low from some drips, don't even worry about it until the first service.