To reproduce, go to "repertoir", then "setlists". Open a setlist and choose "list only" display. Now choose edit to alter the layout. Make sure there are multiple setlist fields chosen for display. Then scroll to the bottom of the parameters page where the field order is displayed. Grab the second field in the list and drag it to the top of the list. Once dropped the field-names jump back in their previous order on the screen. However if you now save and exit back to the list you will have the fields shown according to the change that was made.