It would be the .mbl file in the library folder of your choice when you created the library.
If you are using more than one library there will be more .mbl files.
Sure you can delete them, but that will delete all information about the library, not only statistics.
Do you have any clue at all why a.g. Elvis Presley showed such a discrepancy?
Did you have a lot from him in the past?
Did you have another library that contained music from him?