In my game I have, there is sometimes the chance that when you kill a monster, you kill a different monster that is nowhere near you. I don't know how to solve this problem and it is sometimes a big problem when sometimes you kill another player or a monster that after you kill it, it teleports you somewhere. I do not know how to fix it, any thoughts?

Thanks,
Comusio

EDIT:
[Put into Code Problems with Coded added.]