Duplicate employee names showing in Global Search list of values

Summary: Duplicate employee names showing in Global Search list of values

Content (please ensure you mask any confidential information):

We are facing a issue in a specific environment where some employees showing two times while searching in global search.

One record showing correct employee details and other one showing as Not Available when we click it return a blank page.

But we don't face similar issue in any other environment.

Let me know the root cause of the issue and possible solution.

Version (include the version you are using, if applicable): 23 D

Code Snippet (add any code snippets that support your topic, if applicable):