Just closed and restarted, and everything looks good. ?.

Just switched to Mac, and moved all my itunes music over via an external HDD. I copied everything onto my Music folder, then told iTunes to import and pointed to that folder. It seems to only have imported the first album in any particular artist's folder (some other stuff could be missing, I just haven't gone through album by album). Any reason why this would happen? Is there some option I should check/uncheck? I told it to keep everything organized, if that makes a difference.

Thanks for the help!