You may be in luck - there could be a simple solution. . . .
When you select the underlying 'Divided Path' that the repeater is hosted on, it will display the number of nodes (a blue number above the centre of the divided path)
Sometimes the hosted adaptive component will disappear when you flip the direction - in which case undo and delete it first - as Revit still thinks it is out there somewhere.
If you have just one hosted adaptive component, you may find that it just gets stretched to another location when the direction is flipped.
If that didn't solve the problem, it could be more complicated! Have a look at some of my other posts on Repeaters - listed on the Repeater Index Page