[V8i C++] XAttributes and Element Information dialog

What ties the display of XAttribute data to the Element Information dialog? When I select all the elements in my model, I see numerous entries in the Item Browser for a particular XAttribute "class" but only see 4 entries showing the "class name" in the Element Info dialog:

I expect to see a 1-to-1 correspondence, so something is amiss and I'm trying to understand what is going on and how to "fix" it...

Thanks,

Bruce