How to modify state form: WI Interest from State and Municipal Obligations?

I am in TurboTax and I am amending my state (WI) form.  On the top of the webpage, there is a section titled "Here's the income that Wisconsin handles differently".  The second line in that section reads "WI Interest from State and Municipal Obligations".  The second line's dollar amount is blank.  I click on Edit, and it shows the correct dollar amount in the edit screen.  When I click Continue and return back, the second line is still blank.  So it appears the software knows about the amount, but will not show that amount on this screen nor include this amount when calculating the new tax amount.  I have been unable to find a way to manually override this.  Is this a bug in the software?  Thanks.