Is there anyone that reads

Is there anyone that reads this that knows anything about the behaviour of breakfast cereals? Muesli in particular. I keep my muesli (Waitrose Luxury Fruit and Nut) in an airtight jar. So every time I take a serving from the jar, the jar gets tipped on its side so that the contents can pour into my bowl. You would think that this would lead to a mixing of the contents, but no. Instead, I always end up with the nuts and raisins at the top of the jar, and the oats at the bottom, with the coconut mixed fairly evenly throughout.
Bizarre. This is the sort of thing that preys on my mind.