Bing Search API finds different results from open search interface

Question

I used bing search to search site:www.article-submissions.biz , query string

 http://api.bing.net/json.aspx?Query=site%3Awww.article-submissions.biz 

Total Results: 7

I am looking for him on bing.com, the result is 45.

Why are API results different from a public search interface?