I'm assuming it's an interpretation error, but your picture is too small to tell. If that's HD, click the footage in the project panel and press "Cntl+Alt+G" to open up the footage's main interpretation panel. Change the seperate fields to "Upper Field First"(interlaced HD is always upper field first) and see if that corrects the problem.
Otherwise, we will need to know more about the footage(size, how was it shot, is it compressed...) and all your current project settings.
Johnny Cuevas, Editor
"I have not failed 700 times. I have succeeded in proving that those 700 ways will not work. When I have eliminated the ways that will not work, I will find the way that will work."
---THOMAS EDISON on inventing the light bulb.