[Zope] ZCatalog question... possible bug

I'm using ZCatalogs and I seem to have come upon either a bug or a feature that I'm not liking. I have these three items in cataloged: /company/101578039896 /company/101578039896/101578056020 /company/101578039896/101578050712 Each is a folder with properties. The first one has a property called latestRevision. The second and third objects don't have the latestRevision property. When I add a meta_data column (latestRevision) for the catalog, all three objects get the latestRevision property that the first object has. (In other words, it seems that the 2nd and 3rd objects are inheriting properties from the folder above them.) It doesn't seem like it should work that way. Any ideas? --andy.