About the longsword, the ordinary basic longsword is +0 to hit and does 3d3 damage. It's the Warrior longsword which is +3 to hit - that does 3d3 + 3 damage. The way they seem to have set it up is that the to-hit plus is what is added on to the damage. There's no game-related reason why this should be so, but it may have made the programming easier because there would be one variable fewer to deal with.