Maintaining Library

Hi can someone tell me why when i click maintain library button it opens all of my ripped DVD folders as single VTS and VOB files ? This creates hundreds of files listed in my library instead of folder names. Does this always happen when i click maintain library ? I added all of my ripped DVD folders with no problem and this only happens when i maintain my library.

Mezzmo does not recognize DVDs as whole, but treats them as individual VOB files. We're planning on adding support for this in the future.