SUMX producing wrong result when filtered in both row context and filter context

Thank you AlbertoFerrari .  You have give some sound advice to consider in the future.  I didn't think that I was breaking your 1st principle, but I being to understand how the clustering would lead to problems.  It might works in this scenario, but not in others.  I also took the opportunity to read Macro's Auto-exist article.  I hope there is an answer to odd behaviour.