IE背景中的CSS背景无法正常工作

I have 8 html div's. I have set background of all divs with different image, All are displaying properly except 2 div's in IE8 and in default android browser. If i set any other image for these two div's background, they will also work. But if rename those two images and set them, they wont work. I am confused. Below is the codeI have 8 html div's. I have set background of a