Bug/Issue Help, bug (maybe)

When I press the "e" button on an NPC, they die. But there are exceptions. For example at the Outpost all the npc that are there from the first teleport on him not die. Mainly die to the npc in the villages. For example, I took the assignment to bring one npc in the village to another, and then accidentally "killed" the npc, which in the village and now can not complete this task. I do not want to start the game again and I am not sure that it will not happen again. I play with mods, maybe the problem is them, but I'm not sure. I do not speak English well, so I used an Internet translator. Sorry if that the not so wrote.