When I select multiple lines in outline-mode, and next move them up (via keyboard-shortcut), the lines move up (as expected). But the next line becomes included in the selection.
When I move them down, the last line from my selection becomes deselected.
In outline mode, I select ‘line2’ and ‘line3’. Move them up one line, and the also ‘line1’ becomes part of the selection.
When moving down, only ‘line2’ stays selected.