I don't know how to explain this issue very well, so I apologise in advance.

I'm using a custom map on my server, and my outpost has 2 airwolf helipads on it. With this plugin, I have placed down manually (not the preset outpost option) an airwolf NPC and a spawn location.

The issue is that there are 2 helipads touching each other on my map, and when a player buys 1 heli (any/all types), they're given a heli on each pad. They're getting 2 for the price of one.

I have tried this with 2 NPC's and 2 spawn locations also, and no matter which NPC you use, both helipads get given a heli.

Here's a link to imgur, showing the spawn points and vendors: https://imgur.com/a/PtRuMJI

This is a limitation with vanilla logic around the spawners. The vendor broadcasts to all nearby spawners to spawn a heli. You have to space them out.

You don't necessarily have to spawn out the spawners, but you do have to put the vendors far enough away from the spawners such that the vendor overlaps with only one spawner.

Thanks for getting back to me. That makes sense, I unfortunately can't quite figure this out though. I'm doing some test work now to see what I can do to resolve it.

I edited the map and removed the airwolf spawner from the map itself. I removed even the helipad tarpaulin from there too. There was nothing at all left of the spawner. Unfortunately, even after taking these steps - when spawning in an NPC with the command, and making sure there is only 1 single airwolf spawner, it still gave out 2 mini's. 

I'm going to delete the entire second helipad to come up with a fix for this. 

Thanks again for your time and trying to help me. 

EDIT: Ohh there's something just as strange that I've found out. I added a bandit camp to the map without the airwolf spawner or NPC. When I use the commands, it spawns them in as it should, but when a player buys a heli, one spawns on the helipad perfectly, but another spawns on the spot where the NPC is standing.

I'm beginning to fear that this is a cursed save file or something :(

If you placed any spawners in the map, then started the server with that map, the spawner entity will last throughout the wipe even if you restart the server with a version of the map with the spawner removed. You have to wipe, or use a plugin to find and remove the spawner.

WhiteThunder

If you placed any spawners in the map, then started the server with that map, the spawner entity will last throughout the wipe even if you restart the server with a version of the map with the spawner removed. You have to wipe, or use a plugin to find and remove the spawner.

Ah damnit. You're right though, I accidently placed a spawner where the NPC stands before swapping that around. I deleted all of the monument addon data files too. I had a feeling that it was going to impact the save when I couldn't remove things by just wiping the data files.

EDIT: Do you know what plugin I could use to remove this from the map without having to wipe the server?