That database is heavily messed up.
1,2,3,4,5,6
Someone replaced the official values with 1, 2, 3, 4, 5, 6.
// ID,AegisName,Name,Type,Buy,Sell,Weight,ATK,DEF,Range,Slots,Job,Class,Gender,Loc,wLV,eLV[:maxLevel],Refineable,View,{ Script },{ OnEquip_Script },{ OnUnequip_Script }
The cost of the weapon is 1z, but they sell for 2z. They only weight 0.3. They give only 4 ATK. They give 5 DEF. And they have a range of 6.
Get the official database here:
https://raw.githubusercontent.com/rathena/rathena/master/db/pre-re/item_db.txt