Location Nexus 7 FHD 2013 - SCREEN REFRESH PROBLEM on SCROLLING

SCREEN REFRESH PROBLEM on SCROLLING

Hi everyone,
i have one problem with my nexus 7 fhd.
I try to explain well because this issue is not normal...
When i have my table in landscape mode and i try to scroll facebook , chrome pages , all other program that allow scroll ...the screen on the right render the page smootly but the left part of the screen show a fat vertical line with an oldest frame of the scrolled page...

Its so hard to me to explain.... i report you an image
http://imageshack.com/a/img716/8015/t7hn.png