A bug with one Lookup field accessing data from another look

A bug with one Lookup field accessing data from another look

The following scenario doesn't seem to work. I have three Forms - Lookups, Contacts and Building Details
1. The Lookups includes a Category and and Item, which for this purpose I populate with Category = Contact Type and Item = Owner and Item = Certifier.
2. The Contacts Form includes (for this purpose) a Contact_Type, which is a lookup field that displays either Owner or Certifier.
4. The Building Details Form includes an Owner Field, which is a lookup into the Contacts form, for records of Contact_Type = Owner.

If I use a Dropdown instead of a Lookup for Contact Type in the Contacts, it works fine, which leads me to believe there's an issue with this scenario.
TIA
gabriel.coch