It is very difficult to move sections and activities down because links are not unique. For section the move up/down links are placed above the section's heading not below it, which would make sense.
WCAG 2 2.4.4 (A) 
- Login as teacher
- Navigate to course CF101
- Turn editing on
- Tab to move icon for section or activity and hit enter
- Tab to move to here and try to determine where you are moving the section or activity.