Great that you noticed we rebalanced the XP a bit. You actually didn't lose your XP, but the required XP for your level has changed. You will also get much more XP in the saloons though, so your time to complete the level is about the same.
Also, we just released Android 3.5.0 today. If you are using Android, please update to the new 3.5.0 client. In the new client, there is a much more detailed progression for experience, and you will notice the XP progression clearly.
I hope this will answer your question.