Hi @Vertara 

Thanks for sharing your question with the Klaviyo Community! When products are missing in a catalog, an integration sync issue may be the culprit. Because there are many different factors that contribute to a sync issue, this is a specific issue that would be better served through the Support ticket that you had submitted. An engineering solution is currently being worked on. 

Since the Community forum is a place where our customers have the opportunity to connect with one another and share their experiences and solutions, Support will be best suited to continue troubleshooting this specific issue with you. I'm including our integration doc for you as a reference as well. 

Have a wonderful day!