Bug or Exploit: Invisible Ringing bells placed all over protected spawn

There are bells ringing all over my spawn!! Very loud, won't stop.

I have a world guard protected spawn where players cannot build, but they can interact. There are a couple bells in spawn. The noise is coming from a few random places though.. infinitely. The sounds have survived a restart.

Anyone ever run into something like this? I am almost certain a physical existence of the bell does not exist in game.

How do I get rid of this!?
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