double-clicking grouped tracks removes group editingbehavior

[drguitar]

two 5.1 tracks in a session, both grouped and needing to be sliced and shifted at the same time....hence them being grouped

we were editing them and suddenly realized that sometimes the bottom track wasn't moving with our shifts/nudges of the top track

only things we have observed so far:

double-clicking the top track (within the waveform/region to select a separated area) of the 2 grouped tracks makes it so that the 2 tracks become "separated" from our shifting/moving edits so that the bottom track, though highlighted, doesn't move with our nudges of the first track

double-clicking the bottom track(within the waveform/region to select a separated area) does not seem to separate it from grouped editing simultaneously with the top track

does this behavior make sense to anyone?