It is correct to say that in the main electric panel that the ground and the common wires are not suppose to be attached to the same terminal strip which each other. Should the ground be on one terminal strip and the common wire on the other.
Newer panels have specific listings for their terminal bars, so there are some where the different conductors should be attached to separate bars, but the fact is, both are bonded to the enclosure at the service equipment.
Some people will call the grounded (neutral) common. I see about 75% of my students call the grounded (neutral) common when they first come into class.
This is a “common” (pun intended) mistake through out.