Need help adjusting code which allows button activation

Question

Hi,
the basis of my problem is this. I have inherited some code
which is a matrix of buttons which give a score of 1-7 depending on
which button is pressed. The matrix consist of 6 rows and 7 buttons
and once all rows have a button pressed the final score is
calculated and a submit button becomes activated (it is de-active
until all rows have a score). This works fine, but I have added a
function in which you can press a button which de-activates one row
and activated another, so there are now 8 rows instead of 7, even
though I want the total score to still calculate when there are 7
scores to tally up the total. The code I have now works with the
first 7 scores, but when you add the 8th row it won't tally up the
score, and activate the submit button. I am attaching the code I
currently have to do this. I think part of te problem, is that I
don't actually understand every bit of the code. I know what it
does, but not exactly how it is doing it :-).
Anyway attached is the current code I have:

Answer 1

any ideas on this? I also tried adding a zero button to the
de-activated rows, but this does not work either as a score of 1+
is needed to activate the function.