missionSiteZone 36 is likely a feature of one of the mods you had installed, something that makes alien missions more complex. Changing the value to a lower number won't necessarily fix it and may just introduce more problems.
If you aren't experienced at playing with mods and troubleshooting them, then I would advise you to keep your number of mods low. You may be able to run several small mods as long as they all influence separate parts of the game. But the best way to get a heavily-modded experience is to play with one single mega-mod or total conversion pack. You can also seek out mod-packs, in which each mod is separate but all are known to have compatibility with each other. With a mod pack, you can pick any combination of the mods that you like.