Employees are not appearing in global search but they appear in Person Management searches

Hello,

When we search for a certain employee in the global search, he does not appear, however, when we search for the exact same employee in the Person management, they appear. Employee is active and no actions are set on him at the moment.

He is the second employee in this screenshot in person management:

Under Employment Info, he is only searchable through the Advanced Search Option:

He does not appear in the base search of Employment Info:

What is causing this? How can it be solved?

Any help would be appreciated.

Thank you.