This happens from time to time. Since you're using the online version of TurboTax, try clearing your browser's cache and deleting your cookies, then try again.
See the TurboTax Help articles How to clear your cache and How do I delete cookies? for guidance.
If that doesn't help, see the TurboTax Help articles Why am I stuck in a loop in the File section of my return? and State install/e-file update loop: State not installed after installation or TurboTax needs to update... for guidance.
