Can't add/remove multi-values and reorder at the same time
Regarding editing multi-values (cardinality "many") the detail panel has a limitation: when adding or removing a value (+/- buttons) and do reordering values (dragging) the reordering does not happen once saved. Added values always appear at the end of the sequence. That is you can't add/remove and reorder at the same time. Workaround: after adding/removing do "Save" and do the reordering in another "Edit" step.