Items on Hip will appear using the default sort order "Best Match" which generally takes various factors into account to show buyers the most relevant results.
Factors such as when your items were listed, price, views, location, and other considerations will be taken into account. In addition, buyers can apply different filters and choose to change the sort order from the list of options at the top part of the ‘Browse Listings’ page. If you aren't able to see your listings on Hip, these sorts and filters might be why.
For more information about how to search Hip, see the below articles: