Imagine that you and your friend are trowing a ball to each other, you are in a fixed position, but your friend can move however he wants. Sometimes your friend also comes and cuddles you. Imagine that your friend has dirty shoes and that you can see wherever he has walked. You will see that the thickest layer of dirt will be somewhere near you, however there will also be dirt at your position since you have cuddled a lot. There will be almost no dirt far away from you.
You are then the nucleus, your friend the electron and the dirt is the position distribution.