Assuming that the wine was racked and clear when it went into the gallon jug, it shouldn't be pulp. I've had some high acid wines drop fluffy floaters before (a wild plum that sat in a carboy for over a year before bottling, then dropped some sediment after two years in the bottle). It looked very clear at bottling, so I am thinking a chemical change in the wine over time allowed something to precipitate. I haven't had Skeeter Pee do the same thing even though it's high in acid; but then again, it seldom sits for more than a few months.