The hiring leads will show different from the those assigned in the Settings in these cases below:
If you changed the hiring leads settings after setting up the vacancy. Note: This will not change vacancies already added.
If you used the Copy From option when creating the vacancy - which will mean the new vacancy will have the same hiring leads as they one they copied from.
If the Company, Location, or Department of the employee assigned as a hiring lead is different from the Company, Location, or Department set in the vacancy.