If a condition is not set properly, it is marked by an orange exclamation mark to be more noticeable. You can check the correctness of the set conditions in the tab 'EDIT' - 'Questionnaire' by clicking on the bug-shaped icon (Check the correctness of the conditions) in the dropdown menu of the 'Advanced editing settings'. For more, consult the conditions page.
Upon activation of a survey that contains incorrectly set conditions, 1KA will once again notify you that the survey contains errors. You can start the process of identifying the errors by clicking on the bug-shaped icon, which will show you exactly where to find the error.