I reported this bug one year ago in the bug tracker but I don’t have the impression that it’s getting squashed. So I thought I try it here.
When recording on two grouped tracks (e.g. stereo) and cutting the regions, Ardour forgets which regions of the track 1 belong to which regions of track 2. So it can happen that Ardour activates three regions of the lower track when I click one region on the upper track.
On this screen cast I made, this thing happens around 0:30. https://tracker.ardour.org/file_download.php?file_id=3371&type=bug
With this bug I can not work with ardour and have to switch to another DAW, sorry.