Problem with questionnaire in flat mode

I discovered a problem setting up a roster in flat mode… the questions and input fields are not displaying.

However, if I convert to sub-section mode, the problem disappears.

I would appreciate help to overcome this issue.

Is this screenshot from the Tester or Interviewer App?

If Interviewer, send the info according to the Green list to the support.

If Tester - send the questionnaire name and link to this roster in Designer to the support, alongside with the instructions of what you were entering and in what sequence.