EMWIN Keil LCD display shows half the screen completely!

I have written one project in Keil for STM32F103RE && ILI9325 2.8" TFT LCD, So my problem is this, the GUI_SetBkColor(GUI_BLUE); Function only fill only half of LCD Screen like this:

i.stack.imgur.com/n27KE.png

as you can see the string is "http://www.keil.com" but it have been duplicated in lcd and uncleear to read, and only fill only half of LCD Screen hase been colored.

the defult lCD Pixels is 320x240 and i have setted that in my files,like this pic:

i.stack.imgur.com/JDMZo.png

The could could be found here:

www.4shared.com/.../fwQEsG6kbda

with doubling the x&y Pixels (640x480) it became this kind:

i.stack.imgur.com/dgq0R.png

So what do you think about that?!

Thanks a lot.