"However, abandoned items from other locations are known to reappear on Level 179, so there is that speculation an individual discovered a way to capture and transport these points, and upon the person's death, their sound points were transported to Level 179."

The random "that" in sentence probably didn't help. That was a typo.

Recently, I found a sentence in the article that made me wondering.

However, abandoned items from other locations are known to reappear on Level 179, so there is that speculation an individual discovered a way to capture and transport these points, and upon their death, their sound points were transported to Level 179.

Does "their" mean the sound points or the "individual"? Both of them don't make sense, and I have no idea about it. Can you help me make clear it?

Thank you for helping with the article's grammar :)

This phenomenon is collectively known as "phantom sounds."

A punctuation mistake, I think it is:

This phenomenon is collectively known as "phantom sounds".

I have helped you to correct it.