[RM2K3] DOES MAGIC DO MORE DAMAGE THAN WEAPONS?

Hey so I created a skill Slash that costs 5 mp to use. It deals a damage of 1, with 10 str influence. Now an thing I noticed. If I have the damage type "slashing" set as a weapon it deals about 100 damage, if it also has a second "slashing" that is declared as magic it deals about 200. The damage for rank C damage is identical on both damage types and the skill ignores defence.