May be a bug. This is for Adobe Acrobat Standard DC Version 2015.006.30355. Happens when dealing with RADIO buttons and using Manual Tabs setting. I can move the Radio group field over and over in the right panel, but it will go right back to original position after a Save and open in edit again. After moving it in right panel, it won't change the tab # when viewing tab numbers either. Discovered I have to select "Order Tabs Unspecified", make the move, and then save. It defaults back to Manual after every save (even when still in edit mode), so have to reset to "unspecified" if additional moves needed. Also noticed that even though I have a particular order on the Radio button CHOICES, it will randomly just order them differently. Ex: Made A, B and C choices. After a Save, the order may be C, B, A. Have to set to "Unspecified", manually move in right panel, and then save to make them stick. If it ever defaults back to Manual Tabs while doing multiple reorders, they don't stay. Has to be unspecified. I couldn't find any available reference that said this was the 'normal' procedure. All documents I found always referenced the MANUAL move.