Is it proud of the bolster, or sunk?
I don't think I would imagine a direct correlation between lowering the kick and the pin becoming exposed, but who knows? Pins becoming exposed usually are a result of side-to-side blade stress, or possibly blade opening with little or no lube where the blade can actually grab the pin and move it, but that is pretty extreme.
The dropping could have also had something to do with it. If you were to drop it on the closed blade, that could put a very small bend in the pin, and then the process of opening and closing the knife could make the pin move.
Typically sunk pins are hard to do permanent fixes on, as they will eventually work loose again.
Pics?