HELP! Pivot sorting by data that is no longer there. Trying to clean up the sorting option

PLEASE HELP! I created a pivot table and now that it is completed. I am trying to sort a particular column that should only have three sorting options. When I click on the drop down to sort it has a ton of old data. Is there a way to delete the sorting options that no longer exist? I have checked the data source and it's my current database. Thank you!