Encountering black noise dots while rendering images on SSH server

I’m connecting to a remote server with an A100 GPU via SSH to run Isaac Gym. I’ve encountered an issue with black noise dots appearing during real-time rendering. This problem also occurs when I use logger.save_video to save videos, though it seems to happen sporadically.

We did not experience this issue when running the same setup on our local machines, but it occasionally manifests on the remote server. This issue is not related to corrupted URDF files, as the black noise dots only appear on the lower layers of the URDF objects. But it may caused by loading urdf objects?

I am using MobaXterm and X11 for the real-time rendering window. Has anyone else encountered a similar issue? Any idea will be helpful, thanks in advance!