Try giving the app a 'hard reset' by doing the following:
Double click the home button your phone (the button at the bottom)
You'll now see a left-to-right list of apps that are running in the background. Swipe up over the Dr. Bill app so it's thrown from the screen.
Re-open your app. This should trigger a re-set of your app and it will cause your phone to re-sync any missing data from our servers.
If that doesn't work, please try deleting the app and re-installing it.
If it still isn't fixed at this point, please contact us.