Existing label text is modified but why old label appearing in candidate search filter ?

Summary:

Last year we have created certain Labels and we could tagged labels for candidates.

For eg Label text - Business Analyst. This got tagged to 3000+ candidates. Now this 'Business Analyst' label text has been modified with 'Technical Business Analyst.' Now if I check in candidate search for those 3000+ candidates the label text has been modified for candidate profiles under candidate search but under candidate search filters still old label exist along with new one. 'Business Analyst' is also there and 'Technical Business Analyst' is also there.

But in candidate pool filters the old text is updated with new and only 'Technical Business Analyst'