Are you on Steam or Microsoft Store version?
MS Store
Are you using Developer Mode or made changes in it?
Nope
Brief description of the issue:
The whole South Pole looks strange and has some HUGE ‘mountains’
Location of issue:
South Pole
Build Version # when you first started experiencing this issue:
SU7
Casual landing at FL310
I suggest you read the novel “Mountains of Madness” by H.P. Lovecraft.
These mountain ranges were reported to exceed 8.000m at that time.
At the bottom you will probably find a abandoned camp from 1931 and some three derelict Junkers Ju52 under tarps (these were unable to climb to the top at that time).
Don’t bother searching the tents and massgraves at the camp (one containing the sleddogs of the expedition, mauled but probably still nicely preserved) and absolutely do not fly toward the city located at the top of the mountain range.
If you absolutely must, at least do not go down into the towers basement.
PS: Nice planding picture.
This is not a bug, the strange behaviour is caused by mathematics.
The point is called a singularity and 3D projections cannot handle it properly. Cite, “Infinitesimal changes close to the singularity in one representation may cause large changes in the other representation.”
Calculating the screen image (representation) would require endless precision, MSFS and also your GPU don’t have endless precision !
I found a sound mathematical explanation for this on euclidianspace.com 
