Black/Grey horizontal bars at top of video issue

[bluesteel105]

Hi everyone, I just installed Magic Lantern and have been trying out shooting in RAW. Specs are: 5D Mark III 1920x1080 23.976 fps grading in Resolve and editing in Premiere CS6. I've been noticing a few frames will have these black or grey horizontal bars at the top. They don't last too long but I'm wondering what they are and how to get rid of them. Is this a size issue, frame rate issue or maybe something went wrong in the install? Right now I've just been increasing the video's scale, effectively cropping it out. Any help would be greatly appreciated.