oil leaking?

[steplift20]

I have a 1988 150 mercury o,b,
today after a good day of fishing when i put my boat on the trailer and tilted the engine up all the way i noticed oil dripping from the bottm of the cowl. I took the cowl off and checked the resivior tank and it was full, i never noticed this before but i really never looked. my question is this
is this normal and if not what should i look for and how dangerous is it to run the engine
thank you