This is a limitation imposed by Linkedin that we can only navigate upto 100 pages (after that Linkedin shows error page). So tool will scroll the through the pages and reach upto 100 page (Aprrox 1000 results in total). After that we can not go further and tool either need new URL to process or you can paste the same URL again so the tool will again start from page 1 (As many people would have accepted your request now you will be getting new results for same search query) and will start sending request to new people. You can add the same query again in the target audience as second search URL anytime.
If you face any further issue or have any other query feel free to get in touch.