Making a mod, Weird mob spawns after reload of save.

[Noxus]

So i am building some locations in the GECK and it has been going well. But now i have a really strange bug that I hope the veterans here can help me with.
I have built a level of relatively large size, but not really larger than some vanilla areas.
I run in to test it and it works fine, mobs spawn where they should and keys drop and terminals work. All good. Then i reload the same save before entering the area, runs in and all of a sudden ALL of the mobs have spawned in a room and are basically just standing there. And the companion i bring with me also spawns in that room and starts combat.

If i close the game, and relaunch it works fine. Until i reload the save without quitting the game completely and restarting. I cannot fathom what issue creates this bug. I have not had it happen in the other areas i am making and it is just mysterious.

Any tip or suggestion will be apreciated.

[Laclongquan]

Did you use larger spawn mod or anything that has a script that spawn new ones. Like raider overlord etc...

Without load order list we can only guess

[Noxus]

The only mod i have installed when testing is the TTW and the NVSE/JIP and tick fix.

Edit - maybe it is because of some stuff "left over" in some INI file or something from my NV playthrough? Like some spawn setting or something changed. I didn't use any such thing really, i did use the mojave raiders mod and the wastelanders mod that added some NPCs but i don't know if that could leave some crap behind. Guess i will generate vanilla ini files and see if it matters.

[Laclongquan]

There might be mods that create spawns then its save-baked. Which mojave raiders might be one. But your deaxription doesnt quite fit.

One other possible cause is maximum number of spawns in a cell.

If you set too many beyond the cap, they wont appear until the engine delete the corpses. That might be the case. I did meet that before.

Reduce active spawns. Or cut the cell into two. Thats my solution.

[Noxus]

I will try it and see what happens, i will also totally wipe all old stuff and re-install to make sure nothing remains, and make a totally clean save.
And thank you for taking the time to answer!

[Laclongquan]

The 2nd cause, i met in many situation since i use spawn mod. Sometimes target of a kill quest cant spawn because too many active in the area. So after i go elsewhere then return some corpses get delete and they can spawn.

Dont overestimate fnv engine. Its 15 yo, since the day of f3.

[Noxus]

Ah, i see, i didn't know that it worked like that. Really good to know, and it also answers some bugs i experienced when i was playing NV! Thanks again!

[RoyBatty]

The problem is your mod is an ESP, navmeshes break when reloading so everything will tend to teleport to one location. Things with navmesh (worldspace/cell) need to be in an ESM.

You also need to make sure all your placed NPCs and Creatures are persistent.

[Noxus]

Dude, thank you so much. I had no idea that was how it worked.