Grass rendering problem

I have a grass rendering problem. The game is all about racing around the city by your bike. But the problem is that the grass is rendering as needed only within some particular distance around the bike so that when I move this ‘circle’ of normal grass around the bike moves with this bike as well. What causes this problem? You can see the problem demonstration on the screenshot below as well as camera settings.

Thank you very much,

You need to set your terrain detail distance to your desire.
More info here: Unity - Manual: Terrain settings