Outside of residual hauntings, I think it is possible for spirits to move around. A lot would depend on why they have not moved on, how conscious are they about the state they are in, the type of person they were in life,how much energy can they extend to manifest and so on. Add on the factor of the degree of receptiveness of the haunted.
For all the paranormal activity that have actual rational earthly explanations I am sure there are as many that are actual paranormal occurencess that get overlooked.
With the amount of variables involved, I don't think we will ever get the whole story. Until we see for ourselves and frankly I am in no rush
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