When I enable the plugin on my server these are the spawn parameters I have set. Currently the plugin is completely ignoring these percentages and is spawning the bases at random. As an example I turned the plugin on and had it spawn 10 bases instantly to see if the plugin was working. It spawned 3 nightmare bases with only a 2.5% chance for them to spawn. Only 2 easy bases spawned in and they have a 75% chance to spawn. 

https://hastebin.com/ejolamajus.json

that isn't the % chance that they can spawn. it's the maximum amount allowed. even so it's still broken so i'll check it out :p

Little update, I left the plugin running for a bit and overall the server spawned in another 10 bases. Of them 4 were nightmare, 3 expert, 2 hard, and one medium. No easy bases. This is with the same values as listed in my first post. 

No issues on my end. The config works fine for me. I think this is happening due to the current performance issues in 1.5.13 and 1.5.2

Try using 1.5.1 instead and see if it works properly then

If that fails to work then download this version and save as RaidableBases.cs

https://pastebin.com/m7Lvg7ea

I left it running for about 24 hours after reverting the version and found that there were still issues. We actually had more nightmare and expert bases spawn in than any of the other base types combined over 24 hours.

> rbe mode
Easy : 9 @ L22, N27, M15, O26, P4, T23, M26, E24, C19
Medium : 2 @ A7, J3
Hard : 2 @ Q27, AB9
Expert : 1 @ M24
Nightmare : 1 @ AB10

Yea, I don't know. It's working fine for me on both of my servers. Though I would like to rewrite it, which would likely fix the issue for those it isn't working for.

Though your percentages don't make any sense. 2.5% out of 10 isn't even 1

Maybe it's time for a system that isn't confusing

Yea and I completely agree that maybe I am just being dumb with my config. I have only been fiddling with it for a few days now. 

The config for it looked fine. I rewrote it though. I hated that setting and it limited you too much.

https://pastebin.com/m7Lvg7ea

save as RaidableBases.cs

      "Max Amount Allowed To Automatically Spawn Per Difficulty (0 = infinite, -1 = disabled)": {
        "Easy": 0,
        "Medium": 0,
        "Hard": 0,
        "Expert": 0,
        "Nightmare": 0
      },​

this is the new setting. set the amounts to be the max you want spawned for each difficulty.

Alrighty thanks! Ill test it out over the next few days