So, this is a bit difficult to explain, but let me try.
I just went into my Notes folder, and I found items from various Notebook folders. So, I thought all these items in Notes were duplicates. But, no they weren't because if I delete these items in Notes, it deletes the corresponding items in my Notebook.
I have no clue how this occurred but if it was user error I have no clue how I did this.
Help is appreciated.