When looking at grass at one place, grass at another and then returning to look at grass at the original location, the grass changes. It also ignores the fade out effect that happens when grass disappears into the distance (Beyond your grass view distance setting). This problem becomes more and more noticeable the further you increase grass view distance.

I mean go stand somewhere and look at grass to the north of you, now turn around and look at grass to the south of you, return to looking at grass to the north. The grass to your north has changed variations and if you pan the camera fast enough the new variations will pop instantly into existence after you've panned the camera around. How do you fix it so that it either no longer changes grass variations or the grass variations smoothly fade into existence?

Try exiting the game and geting back into it.