The phase line is a "baseline". If you are to one side or the other of it in a gravity well, you usually when phase into the new system to that side as well.
When you select your movement to the new system, zoom in a little on it and notice where the blue arrow points. This shows you where you will arrive--and travel to after arriving--before your movement order as given is complete. If you don't like it, you can adjust it by repositio9ning to one side or the other--or changing your stop point in the other system.