Terrain being flattened at default airport

I73 Moraine airpark. For some reason I can’t figure out, the sim is flattening out the levee around this airport, If I load up the Dev mode and look at the isoline view, you can clearly see the mesh, yet when the sim populates the airport, it flattens it out almost as if there is a terrain proximity setting for the runway. In one of the screenshots you can clearly see on the left side the levee is intact and the terrain is correct, but the closer it gets to the runway it gradually flattens out.

Does anyone have any idea what I can do to correct this? I’m not opposed to rebuilding the airport, but I’m not sure how I would keep it from wiping the terrain data.

Here is a youtube video from a couple years ago, and you can clearly see the levee all the way around the airport still in tact. At some point it seems a SU broke it. https://www.youtube.com/watch?v=2R037xrf5Uc

Thanks!