That's not good. I experience the same issue. If my basement door is slightly cracked, the return that was added to the basement (I assume when it was finished) can pull the door closed. If the door is open enough, it won't happen. It looks like they just cut a hole into the return trunk, so the force isn't surprising. My basement door is right off the room that has the chimney.
I also wonder if this is the reason why I don't get as much return airflow into the upstairs return--because of the return cut into the trunk right by the a/h.