Landscape gizmo and my character is not working

hi. first of all i apologize for my bad english. i have an issue with landscape gizmo. i am using world machine and when i imported a height map to unreal engine landscape gizmo is locating wrong place. and my character is stopped moving after i imported the landscape to my project. when i hit play button my character is not seen in anywhere and i cant move around. is there any way i can fix that ?