There seem to be plenty of places where the UI is confusing and you can loop forever. Just click "Continue" and see if that takes you to the screen to enter your property taxes. Worst case, you have to go back if it gets skipped.
I don't know why the first time you get to a spot to enter new data it loops back to the same place when you're done instead of moving on. It should at least have a question at the top to see if you need to add more.
