I'm having a bit of an issue with Journey Builder's Decision Split; it keeps routing contacts to the incorrect path. Wondering if you could help?
I have an JB entry source DE "Entry DE" and a "Master DE". They both have the same PrimaryKey and are connected 1:1 on Primary Key. Master DE's PrimaryKey is linked to Contact Key on Contacts.
"Master DE" has a field called "Member No", and the decision split is based on this "Member No" field. JB keeps thinking all contacts have "Member No" even though only half of them do. Any tips what to check to resolve the issue?