When you group move a fleet to a jump lane preparatory to jumping, the orientation of the group is rarely set in the proper orientation to jump.
Please adjust the group movement so that when you click outside the grav well (like on the jump line itself) the fleet sets up perpendicular to and outside the well so it doesn't have to re-arrange itself to group jump.
Alternately, allow for an orientation arrow to appear (when the group move is enabled) when you depress the right mouse button and then move the mouse in the direction you want the fleet to face before releasing the button.