MX Simulator

so im trying to make a 3d scanned track its a track called competitive edge mx some of you socal riders prolly know it but i 3d scanned it got the heightmap and baked everything and the difs and i have all the stuff but in game the overlay shows up full size but the track is like endless for some reason and in editor mode the overlay looks like a dot and the heightmap wont show up. please help me out
my discord is:
braap44#6253
thanks