If you have the long plastic oil reservoir, they are notorious for cracking along the seam against the gas tank, you can't see it,,,so they leak to that point, once in a blue moon they crack along the bottom,,,then all the oil comes out,
If its a 785, I believe the oil seal on the rotary valve can leak....I doubt its a bad clamp on a oil line, super rare or a cracked oil line,,,but,,,anything can happen with seadoos,