Strange issue where vanilla CargoShip npc's are spawning random on map

First of all, love the plugin!

I run a small one-grid (1500K) server.

I've run into a little issue, and I don't even know the issue is even related to betterNPC, but know that after restarting BetterNPC plugin the issue resolves.

The issue is that it seems that once Cargo ships spawns the server spawns two sets of NPC's. One on the ship and one seemingly random on the map. It does not spawn all cargo NPC double, just the ones on the upper outside deck located at the rear of the ship.

Once it spawned the NPC's double on the ship itself, but often is spawns it randomly on the map and the NPC's are floating in formation and sometimes i think it just don't spawn the double set.

Thing is, the custom NPC spawns for cargoship is disabled in the config..

If I notice the NPC's, I restart BetterNPC and the "extra" NPC's are removed so i guess its related.

I don't really know what to do and maybe you have some ideas..

Hope you can help.