Well, I see at least 3 logic errors in that file. You have question validation equations like ! is_empty(Q14_1.NAOK) and ! is_empty(Q14_2.NAOK) and ! is_empty(Q14_3.NAOK) where there are only two sub-questions in that question.
Review the logic file, fix all errors and retest.
Cheers,
Tony Partner Solutions, code and workarounds presented in these forums are given without any warranty, implied or otherwise.