Steps to recreate the problem (with screenshots)
Step 1: enter search terms and filter results by selecting "Show only - Free Shipping"
Step 2: List of items appears, all marked as free shipping
Step 3: Click on the item link, to open the details. It is observed the detail view shows shipping charges, while the search view showed shipping as free.
Effect:
Buyer pays more than actually shown on the search page. instead of paying (item cost + free shipping) the buyer pays (item cost + shipping charges)
See attached document containing step by step screenshots.
