LG VX-8550 Chocolate

OK so I have a mac and have just purchased a the LG VX 8550. I quickly learned that the syncing was not compatible with macs and itunes so I bought a card reader and did the whole "click and drag thing". But then when I put the card back into my phone there were duplicate files of the songs(oddly names "bj") and won't play. Yet when I put the card back onto my computer the files aren't there! The named music files do play on my phone but I'm curious about these other files because they a. take up storage space and b. get in the way of trying to play through all the songs (ie on shuffle). If anyone else has a mac/itunes and VX8550 problems and could help it would be greatly appreciated. Thanks.