I'm not a local to this area, it looks like the main exit (34B, Hampton&Oakland) branches again, with the right going to Oakland and the left turning right onto Hampton or turning left onto hampton going to "forest park" if you keep left. Not sure where forest park is  (I guess north on Hampton), but the tagging seems to match the signage. I think your navigator is reading it as forest park because it's specified first, but not sure about that. Perhaps this tagging could be improved using destination:lanes to specify that the left 2 lanes are marked forest park and right 2 are for hampton, but again not an expert here. Thanks!