Missing elements when performing a search on “Local SharePoint Results” source

Question

I have a library with 4 documents returned by a specific term (when using the search box at the top of the library).
But when I try to perform the same search on a webpart linked (by default) to the "Local SharePoint Results" source, I get only 2 results.

All these elements (documents) have a unique name.
What could be the issue?

Answer 1

Whenever you are seeing unexpected query results you should check:

• Is Duplicate Trimming happeneing, turn it off in the web part.
• Are the permissions getting in the way, try again with an account that has rights to the content
• Has the content been crawled (this is not your case, but here for completeness)