Reported: A Siege Kit bought from the Accretia Outpost shop arrives at 1 durability out of its maximum, so it is used up and disappears after a single shot.
Found: When an NPC shop sold an item that does not stack, the server set the item's durability to the quantity bought instead of the item's full durability. One kit bought meant 1 durability, and each siege attack spends 1, so the kit was removed after one use. Siege Kits from the cash shop already arrived at full durability; only the NPC shop path was wrong.
Fix: Items bought from an NPC shop now arrive at their full durability, and buying several of a non-stacking item gives that many separate items, each at full durability. This ships in the next RF Online 1.5 update.
Also affected: Every non-stacking item sold by NPC shops, including weapons, armour, ammunition, tools and batteries.