Actually I experienced something similar with Multibit a few days ago. I sent a small amount of bitcoins to one of my own addresses and noticed the transaction was only living in the multibit client but did not seem to be broadcasted properly. After resetting the Blockchain two times for all wallets and a few restarts of the client it finally forgot the transaction and showed the correct amounts and I could try again successfully.

You can reset your Blockchain using the "Tools" menu. It may take a while. Good luck!