Please open the attached example and select all lyrics by using select more (Engrave mode). When I now move the lines using Alt + up or down (or Ctrl + Alt + up/down), the lines move quite different. I would expect all lines to move by the same amount of space.
One addidtion:
The Lyric lines only move different, when I use Select more to select the whole text. If I select one word in every staff, the text moves as expected using the shortcuts.