Understanding Screen Re-draw

SCREEN REDRAW,

Can someone please explain “Screen Redraw” (I am calling it ).

Today I flew Canyonlands and Zion, Utah and this seems to happen mostly in very canyon-like mountainess terrain. This happened all the time in FSX and I was hoping with my high-end system it wouldn’t happen so much—the mountains and terrain textures are constantly re-drawing/updating as I fly. I don’t know how to video capture a flight, or I would include an example. It is almost as if the terrain is animated and it really hurts with the sense of immersion. Hills and rocks keep growing and changing. Is this something that could be reduced with LOD setting ( I tried from 100-200) or manual or rolling cache.
I am really hoping someone can explain this to me .
THanks.
i9 10850k
Valve index (but this probably happens on the screen as well)
RTX 3080
32 GB 3200 RAM
1 TB firecuda SSD drive for FS2020
using nvidiia 457.30 driver

Thanks so much