Why current flow from higher voltage to lower voltage?

Normal flow of electrons are from positive to a less negative potential. When a potential is applied meaning voltage electrons leave their orbit and move to another nucleus leaving at the same time a hole to be fill out by the next electron coming in. In essence electrons flow one way and holes flow in the opposite direction. It is possible to have -100v flowing into a -90v. electrons do not know what the potential can be raised to all they know is the differential potential of 10 v in this case

It doesn't. If flows from a higher potential to a lower potential. Voltage means 'potential difference', which is quite different.

A 'higher potential' is conventionally taken as meaning 'more positive', while a 'lower potential' is taken as meaning 'less positive'. The direction of conventional current (plus to minus), therefore, is from a higher potential to a lower potential.

Electrons, on the other hand, move from negative to positive, so they move from a 'lower potential' to a 'higher potential'.