People search returns the wrong results for a specific name

Question

Hi,

In people search, when i search for a name "mark" it showing around 40 results. The results were are based on name, department, job title. The issue is the department matches are showing at top of the results instead of name matches. But other keywords like "ger"(germany) showing the correct order results like gerald and germany after that location matches.  so how to bring the name matches for "mark" at top most result? other things working fine except the keyword "mark". Any ideas please

Thanks in advance.:)