In a member's profile, you will see a summary of their activity across all publishers.
It may look like this, with a discrepancy between number of requests (26) and number of books (24).
The top number, 26 in this example, is how many manual requests the member made. This includes titles they found in the catalog and pressed "Request" for and titles they Requested and received instant access to because they were auto-approved by the publisher. This number does not include titles they received as a granted Wish, titles that are auto-approved for, Read Now titles, or Widgets.
The bottom number, 24, includes all manual/auto-approved titles, all Read Now titles, all granted Wishes, and all Widgets. Simply: all titles they have access to.