Golden-Horn quest

Hi, I'm fairly new to this server, but not to Eudemons, I seem to be having a problem with the Golden-Horn quest, i have 20 golden horns but the NPC is not seeing that i do, is it because they are not stacked together, and if so how can i make them stack as it just puts in my bag automatically?

I have figured out how this works since posting this, for those new people just starting, you need to drop item and then pick up, for items automatically added to inventory, to stack. Then NPC will recognize that you have the right amount of items for reward.