Ok, thanks for the follow up info.
Have you covered all the basics?
Of course the profiles for Airdrop and Hackable spawn/hackstart should have AutoSpawn set to true.
Profile radius should be reasonably big, to allow for unknown terrain.
Number of bots (day/night) should be greater than zero,
and if you have any population scaling set up in your global config page, that should be taken into account too.
Check they aren't set for Chute true, or make sure to look up if they are.
Also watch console when you're expecting these npcs, in case there's any 'failed to spawn' message, or anything else that's relevant.
It's possible for other plugins to interfere - Maybe killing npcs which spawn in a certain zone, or in close proximity to other areas/events.
This is unlikely, but worth mentioning.
I know I'm stating the obvious here ^ but it's best to be sure.