[SOLVED] Possible GPU problem on GTA 5 shadows

Here's the problem:

Is it bad game optimization or is this by the gpu? My GPU is MSI Gaming X Trio GTX 1080 Ti and on GTA 5 everything is maxed out at fhd 144hz. This long glitchy happens only on GTA 5.
Also, sometimes sky is flickering but it's barely noticable...

Any solutions?
I don't know about anyone else but I'm not downloading some random file from mega. No offense.