This is what it looks like.
when you filled your oil most recently, did you change the oil filter?
do you know how much oil you put in the bike?
to me it looks like the bike has been overfilled with oil and its coming out the overflow tube. Its not extremely over filled, but enough so that as the oil warms up it splashes up into the overflow tube and as it rests slowly drips out.
if you changed the oil without changing the filter, and put a full 3 bottles of oil into it, you put like, 1/6th or 1/9th of the bottle too much into the bike.
that'd be my first guess.
if you did change the oil filter and the oil, then i'm not sure what you did differently this time versus the previous time you changed the oil. maybe you didn't let it drain out completely?
oh edited cuz i re read the original post and noticed you said its directly below the drain tube and not the plug...
one other thing... there's another tube down there with a plug in it, maybe its full of stuff and needs to be cleared... might be causing too much pressure and squirting some oil out the overflow...