Problem: Calculating a final score on a form using Radio Buttons as values

I'm working on a form that has 9 questions. Each question has 4 answers - either A, B, C or D - and the user will pick the answer that is most relevant to their situation.

Each question is a group of four radio buttons and are marked as Q1, Q2 etc., up to Q9. The radio buttons within these groups are marked as "4", "3", "2" and "1" as these are the values I wish for them to return. The idea being that A = 4, B = 3, C = 2, D = 1.

There are three questions per page (3 pages for 9 questions) and on the final page I wish to display the total score. (As an example, if the user picks A for all 9 questions, they should receive a score of 36.)

I am using a text field on the final page to display the score. Under the 'Format' tab I have the Format Category set to 'Number' and the Decimal Places set to '0'. Under the 'Calculate' tab, I have "Value is the sum (+) of the following fields:" selected. When I go to Pick, I select all 9 questions (Q1 -> Q9). However, after selecting OK, the questions do not appear in the box:

Am I doing anything wrong here? I have saved and reloaded Acrobat several times and have confirmed that the form does not require any signatures. The form was built in InDesign and then exported as an interactive PDF. My InDesign version is 17.0 x64 and my Acrobat version is 2024.004.20272.

Thanks in advance.