LinkedIn_api search returns same results everytime

I'm using this library - https://github.com/tomquirk/linkedin-api

The problem is: The first time (after authorization) method 'search_people' is called with parameter 'keywords', it returns great results But when I execute this method again to search for another person (with different 'keywords), it returns the same result as for the first time

Please advise what could be causing this problem?

Thanks!