Hmmm... I'd be looking at my deinterlace preparation method.
It would appear that you are seeing the 2 fields of interlaced media. You will notice that this is ONLY visible on moving items or where you are MOVING the camera - same thing!
Basically, our cameras videoing in 25fps, are in actual fact capturing 2 fields of information. That's 50 fields every second, and at some point these fields need to be interlaced to produce smooth edges. Now, if we then produce a rendered file format that is not prepared to REDUCE this interlacing - a deinterlace method - then these fields will become stubbornly apparent. This I believe is exactly what you have here.
The site below is very useful, please read it and consider to render a de-interlaced file!
What is deinterlacing? The best method to deinterlace movies
Regards,
Grazie