Edit: Figured it out.. I had assigned the hat and the paddle which were also assigned to UI. Once I assigned those differently on the galaxy map it works fine. So, lesson learned, do not assign anything on the galaxy map screen that is assigned for UI elsewhere..
I leaned this lesson too. Almost all of my UI settings carry over into the Galaxy map. The only movement settings left on the stick are traversing the Z axis and Hat switch up/down to control the map pitch. I use my mouse to manipulate the view then switch to the stick to nudge the selector to the star system then left/right hat to navigate the floaty sub menu.
Also, I found that when trying to plot a course in planetary view, traversing the Z axis won't move the selector. This is where the pitch up/down on my hat switch comes into play as it "bodges" or snaps the selector to the settlement after I rotate the view by mouse.