Where are you seeing best sellers? Can you share a screenshot of what you are trying to edit? From there, I can assist you with any potential solutions.
If there is anything else I can help you with, please let me know.
@PgSneaks Is this 'best sellers' section showing below your product page? This appears to be an automated collection section based on your theme. It will automatically pull your best sellers and showcase them there. It's not a section that you to manually choose what goes there.