Sometimes...
Sometimes the float will not shut off incoming fuel after a ride. Make it a habit to switch fuel valve off when done riding even for a short ride. If you switch fuel valve off, there could still be a little fuel to leak out, but not much if any. Another problem that can cause this is the white plastic float donut gets filled with some fuel because it may have a hole in it. If your donut gets some gas in it, it will not float well causing excess fuel to run into your motor and out the exhaust, intake and other places as well. Oil drip or seap from various places such as head, cylinder base, exhaust ect., is normal. Keep your engine and bike super clean. That way if there is a problem, you will know right away because you will see it when cleaning. A dirty bike and motor is a bike and motor getting ready to fail.. Keep your bike and motor clean !!! Enjoy the ride....