I wonder if the bow eye was used as a lifting eye and it wasn't optioned as a lifting eye. Regardless, it needs to be checked out.
Truthfully, that shouldn't do it. The Lifting Eye option, from what I know (don't know) about Grady is that the bow eye is then tied in to a center cleat on the deck - and THAT is then used as the lifting point (making it a bit easier). But it's quite normal to lift a boat with the bow eye - in fact, VERY normal.
That said, If someone was lifting erratically from the bow eye, that's a possibility. Well, actually, it would more likely come from lowering the boat and very quickly stopping it. It's still a bit of a long shot.
But, hey, that's still just guessing