I've seen a number of sleds with the erroneously flat upper lip and I've yet to see one interfere with the insertion of the player. In every case, the extended lip fit just fin into a recess on the back of the fascia. I'm sure that's not by design, but it happens nonetheless. I think blaming anything on that is premature. On the other hand, it may be worth looking at in case the happenstance fit doesn't occur on all players/fascias/sleds.