Based on the details provided, a common root cause is a redirect. When this happens the original referrer is often dropped, resulting in an internal or blank referrer (direct). Have any tests been run to look at the image request of the landing page? Check the referrer information.

Hi, I was reviewing some older posts/questions. I assume you have already found the answer that the "splitting up" and persistence of list var values will come after any edits made via processing rules.

One point of clarification: Andrey's suggestion is spot on for finding users that have every been to your tracked property before. If the question is return visitors *during* the selected date range, you'll need to create a sequential segment to look for visitors that had more than 1 visit.

Hi! While I am not sure I fully understand your use case, I don't think you are missing anything. This kind of analysis / segmentation / calculate metric is not really possible with the product variable. This is because the product string is a 'list Variable'. A segment pulls back the whole product string when at least one product matches the segment. So, there is not really a way to say 'THIS, but NOT THIS' in a product string. For example, if you had a product string of: "ProdA, B-Product" -A ...

The first FAQ on this doc talks about (explains) this situation: https://experienceleague.adobe.com/docs/analytics/analyze/analysis-workspace/attribution/faq.html?lang=en