i am talking about canada usa scenario by land travel only.
When you enter usa they give you i94 and entry stamp. when you come back to canada, they scan your pr card and no stamps.
when you enter usa next time within next 6 months, then no stamps are done and it goes on till you get next i94
what i have observed in the forum is that many people have reported that their enteries in usa were correct however, exits were not correct because when you enter usa, they scan your passport. when you enter canada, they scan your pr card.