Hi graygirl61,
When you lower the prices of store items, we are unable to retrieve that information because eBay does not generate a "seller event", which is a notification that something needs to be updated. This "bug" is something that we plan on addressing as part of a future release.
In the mean time, when you lower the prices of your items, please file a support case regarding this issue using the appropriate link on our help page and request that we update your Auctiva store/store window prices manually:
http://www.auctiva.com/free_auction_software_help/help.aspx
-Mike