Thanks very much for this detailed writeup and for including your form, @jules_rugwiro. I can confirm that there is a bug and that you should use v1.27.3 for now. I don't yet know what the scope of the issue is but I believe it is related to what @dmwanga reported at Collect v1.28.2 - error about two different forms with same formid and version and constraints not accepting valid values regarding having to swipe more than once for certain constraints. @dmwanga if you could please share your form or a small form that shows the issue in that thread, that would be very helpful. Even just letting us know whether you only see this in repeats or not would be helpful.