Ati card bug in metro 2033

Hey guys, I have got a ati card recently ( HD 7870 ) After I have update metro 2033 to v1.2, I enter the homescreen of metro 2033, there are some blue colour showing on my top right screen. Later i have found that if i change the graphic to high, it is nothing happen but when i change it to very high, the blue colour come out. I also found that if I play it in very high, sometimes the thing become invisible, I can look through the wall and the door. Can anyone tell me how to fix




I am using

i7-3770 3.4 Ghz
16 GB ram 1600 MHz
2 TB SATA 3.0