[Koha] Why OPAC results from "Library Catalog", but not 'Title' or 'Author'?

[Joel Ewy]

Hey all,

When I do a search in OPAC, (Koha 3.08) I can get results if I have 
"Library Catalog" selected, but the same search returns no results if I 
search on 'Title', 'Author', or any of the other options in the 
pull-down.  Does this mean Koha is finding the MARC record but not the 
holdings?  If I select one of the results from the "Library Catalog" 
search, there is a tab at the bottom that says "Holdings (1)" and has 
presumably correct data.  Any big-picture information on the 
relationship between the MARC records, the holdings data, and how Zebra 
does its indexing would be most helpful.  Thanks,

Joel Ewy