Ground changes color when moving

Could only play the training mission but got the following issue:

When the training starts, the ground around me has a grayish color, when I start walking or use the mouse to look around, the ground turn to red-brown color. If I stop walking or moving the mouse, the ground turns gray again.
The only thing that changes is the color, the ground structure remains unchanged.

It is a bit irritating.
 
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