I haven't seen this behavior myself, all clips moving when right click selecting
but what you may be seeing is edits to your clips (they're underneath clips as well
that's why its a good idea to bounce to clips your clip after you have done editing to it.
try a test, drag in about 5 clips from the browser.
lasso all these clips and move them, im willing to bet they all move.
now try editing some of those clips, edit midi data/replace midi notes, exc. now move them with out bouncing to clips.?
see what I mean ?