In room mode with the scale unlocked, zooming a map that already has rooms drawn (scroll wheel, the +/- buttons or pinch) puts the dashed lines that split a room into pages in the wrong place. They are shifted away from the room's outline and run past its edges, always one zoom step behind the map (see screenshot).

To reproduce:

  1. Upload a map and switch to room mode.
  2. Draw a room large enough to be split over several pages.
  3. Unlock the scale with the padlock.
  4. Zoom in or out: the dashed page lines no longer line up with the room.