When listening to extraordinary reports happening on the mission field, here are some possibilities:
(1) The missionaries and/or the host group are gullible and open to such happenings and thus produce a climate that aids in the false-observation or over-reporting of these happenings.
(2) The cultures are more steeped in outward spirit worship and so spiritual forces are also more outward. Or at least the interpretation of things tends towards more of a spiritual attribution.
(3) In pioneering areas where the gospel has never been preached, there is a more dramatic clash between the gospel and the former powers. And in cultures where the spirits are actively invited into people or contacted, we will see more real spirit activity.
I believe all 3 options above happen on the mission field.
The West versus Animist cultures - a difference in worldview:
On one hand, remember that the West is largely secular and poo-poos the demonic or extraordinary. Scratch a Western Christian and underneath many of them you will find a secularist who largely does not believe in an active spiritual realm of angels and demons or in the supernatural. This is wrong and unbiblical. There is, indeed, a real war between spiritual forces happening, even now.
On the other hand, scratch many a 3rd-World Christian and underneath you will find a functional animist who sees virtually everything to have spiritual causations. This is also often wrong and unbiblical. In our struggles against the world, the flesh, and the devil, 100% of our struggles are not due to demons...but often due to the sin natures of people.
Self-serving reports:
Also consider the self-serving nature of some reports. Such reports gain an audience. And, if the devil targets you...then, well...you must be worthy of being a target. Thus, these stories become a convenient way to enhance one's spiritual prestige.
A real story: In Papua there is a good missionary who has charismatic leanings. He is very nice and seems to truly believe and has a thriving church. Part of his personal testimony, however, was that the Lord used him to raise the dead back to life again. A person who was drowned returned to life with their prayers. This episode figures prominently in their written testimony.
BUT....here is the problem....
I have also "raised" 3 such "dead people" myself. Tribal people who have a fever or are hurt or scared...well, many of them will lie inert and unmoving and appear, to all present and untrained, to be dead.
But if you administer a shot or start an iv or sometimes just pinch them out of their inward-focused nearly comatose state (often out of fear, it seems) they re-enliven and wake up.
On these occasions, the people have said, "Oh he's dead" but then, "Oh, he came back!" If I desired so to do, I could easily stir these misperceptions to enhance my status or else, if I believed such things were happening myself, I could believe it to be so and send an astounding report back to my churches. As it is, I praise God for healing, yet avoid reporting that I have ever raised dead bodies back to life again.