Webkit redraw issue

When i am opening and closing the menus some junk pixels (gray boxes) are getting displayed on page.Its getting fixed when i am showing and hiding the parent div.Is there any other way to fix this issue.

Please see the following images for seeing the problem(Check in order 1-Normal page , 2 - Page after menu opened, 3-Menu closed-still junk pixles are there)

Thank you
Rohith R