It's also showing more hull and crew than are available, for example 15/10 hull. The numbers look like the adjustments for advanced games. Go to the first turn of any (advanced) game and it will show, as an example, 15/10 hull and 24/12 crew. For advanced games, hulls are increased by 50% and crews are doubled -- that seems to be what it's confused about.

It also seems to be showing only the fore guns, but is calculating the correct hit table for the entire broadside (including the invisible aft guns).

I haven't checked basic or simplified games.

Hope that helps.