Hi daymay23,
Sorry about the misinformation. It appears that the store window is displaying 14 items at a time.
If your store window is displaying 13 listings when you have more than 13 items listed, there is something strange going on, so I suggest you file a support case regarding this issue using the appropriate link on our help page:
http://www.auctiva.com/free_auction_software_help/help.aspx
-Mike