Tell us what it is that you did specifically. Are your additional contacts folders sub-folders of the main one for instance? Or are they the same level as the main contacts folder, just listed directly below the main one on the folder list? Which folder are you trying to export, the main one? And does it have sub-folders? If this is the case try moving the contacts folders to the same level as the main one and do your export again so that the folder you want to export has no sub-folders.