Does some current return to the power company through ground?
The wiring can vary in different countries, but that looks perfectly normal.

Current can't just go to ground and disappear.  Think of the Earth as a very big spherical conductor.  If any current does go through the ground, it will end up at the earth electrode of the supplier's transformer.  So the Earth is just an alternative path in parallel with the neutral conductor.

In practice, copper is a better conductor than dirt, so most current goes through the neutral.