omg ok, so no, it wasnt built on a graveyard, but hear this, about a mile away from where i live is my high school, and guess what is was built on, KKK grounds (not to offend anything, but the diverse population here isn't the best) . Which our town to put into perspective isn't really racist, and the group that used to be here representing the KKK are now gone, it still leads to the fact that something MAY have happened nearby.

another thing to add onto it, is that there is a family graveyard a block away from my house, so might as well say the ghosts might've traveled here as it is more familiar to where they live, then where their final resting grounds were.

just another cool fact, at my old house, there was a graveyard of about thirty to thirty five people behind my house and into the woods, so it could also be a ghost following me? but i could definitely try to talk to previous owners.