so i just changed my oil, and when i run the bike for a bit, then park it the oil is not in the sight glass. so i fill it up thinking well hey maybe i just was an idiot and didnt fill it to the level it was supposed to be. when i ran it again after parking it the oil level was down again. whats going on? the oil is not totally gone, when i tip the bike past level it comes into the glass its just not full like it should be, theres also a white foam on top, very little bit? please help me out here.