I’ve seen this kind of thing in guys who really pull with their front side to try get more power our of the back side - think catapult. In this case, it doesn’t really look like he’s pulling real hard with the front side; however, the result is the same:
the head and shoulders tilt toward 1B
the release is back around his head instead of out in front of his head
no back side stability/support with the legs.
I agree with Roger that he needs to work on keeping his head/shoulders level. For this player, it will cause his arm slot to appear to lower; however, if you look at where is arm is in this video and mentally tilt him to where his head is level you’ll see that is what his normal arm slot really is.