Sharing this solution from another thread related to KDFW in the hope that it helps those with issues at KDEN. However, I will say that these problems usually indicate a competing scenery in the Community folder. For those with the issue, please try to load KDEN with an empty Community folder to see.
In the meantime, please review this solution that helped fix bad problems for me at KDFW. World Update X added some bad photogrammetry
https://forums.flightsimulator.com/t/kdfw-ground-texture-problem-pc/593144/128?u=darthandy1138