One possibility is loading girlpacks inside other girlpack folders. Can you post a screenshot of your game/girls folder, and ofthe the folder for the girl that Kawakami is created from?
I think you may be on to something here. Another clue in this direction is that all of the girls have the same name. This is telling me that the game thinks that there is only one girl pack, and is building multiple clones off of this one pack.
For Dasneaky, the key here is that unless you name things in a very specific way, all girls packs need to be placed at the top level of the girl pack area. They need to all be immediately under the girl pack directory. If they are under other folders, the game will consider them to be all part of one girl pack.
The exception is that you can create organizational folders by starting the folder name with #. So for instance I tend to have "#Anime" right under the girl pack folder, and under that I have folders for individual series, also starting with #.
So my conclusion is that either you accidentally built up the girl packs under a separate folder under the girl pack directory, or you tried organizing them without the pound sign.