Servus,
first of all - I assume, you haven´t installed any 3rd party addon scenery, right? When I´m wrong, which 3rd party addon have you installed?
Second, please try this steps (exactly these steps please!):
After that, try it again … I have also tried it now (MSFS 1.19.9.0 - stock data) and indeed, it looks correct on my machine also. So I guess, you have any mess in your scenery-content file, therefore please follow the steps from the link above and try it again. It should work (at least you haven´t installed any 3rd party scenery).
Danke & liebe Grüße
Richard