When selecting several regions, if I drag them they keep their relative position. But if I copy or cut and then paste, all of them are inserted on top of each other at the edit point.
I don’t have this issue using copy and paste on ardour 6.6, regions keep their relative positions. It also works to copy and paste ranges.
Can you make a screenshot maybe?
For other methods, you can select the regions and use ctrl+drag with the mouse, it’ll copy the regions while keeping their relative positions. You can also duplicate them using the contextual menu or a shortcut. I often prefer to select a range and duplicate the range though, it behaves better for my needs.