You probably installed a software update. When the TurboTax software is updated, it loses track of where you left off, so it goes back to the beginning of the interview. But all the information you entered is still there. Use the tabs at the top to go back to the expense topics that you were working on.
If you were away from TurboTax for a few weeks, I hope you did install the latest update. If not, do it now. On the Online menu, select Check for Updates.
