I believe you have experienced the Law of Conservation of Matter and the idiom 'Nature abhors a vacuum' first hand!!
The classic view on conservation of matter is this: all matter is composed
of atoms of the various elements, and the total number of atoms in the
universe remains constant. That is, you can rearrange the existing atoms
in any way you like, but you cannot cause additional atoms to materialize
nor can you cause existing atoms to disappear.
The "Nature abhors a vacuum" idiom is used to express the idea that empty or unfilled spaces are unnatural as they go against the laws of nature and physics.
So, by selling your car, you removed that matter, transformed it into the energy known as money, and created a vacuum on your driveway! The energy (money) BY LAW had to be turned back into matter - an LBC - which HAD to occupy that space on your driveway - again BY LAW!
So breathe easy, you don't have a disease OR illness, it's just the laws of Nature at work!! :laugh: