Why are some spirits earthbound?

Answer 1

Some spirits are bound to Earth by unfinished business from their human forms, they are given a chance to complete that which they could not finish. It could be something as simple as returning something they once took from someone, or wishing their goodbyes upon their relatives. These earthbound spirits have a history of becoming excessively violent if their unfinished business gets severed in some way, they can become Poltergeists and attack people undeserving.

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Answer 2

Some spirits may be earthbound because they have unresolved issues or unfinished business that keeps them tied to the earthly plane. They may have trouble letting go of attachments or fears, or they may be unaware that they have passed away. Additionally, some spirits may choose to remain earthbound out of a desire to communicate with the living or fulfill a specific purpose.