Problem with scrapebox

Hello guys! I have the problem. I tried to run 13 scrapeboxes on the same VPS and after ~24 hours I got these results: 3 scrapeboxes were with 300-700k urls scraped , but the remaining 10 were with only 20-40k urls scraped. This is very big different , isn’t it? I used same footprint and even same keywords. Just locations were different , but all of those locations were quite big so i dont think its location problem. Its not possible that out of 13 locations only 3 were big enough and others 10 weren’t. So I’m wondering where can be the problem that I got this issue? If anyone could help me I would appreciate it a lot! Because I need all scrapeboxes to scrape like 300-700 or more urls , i dont need 20-40k urls per scrapebox , its just way too less…