That is called interlacing.
What are your export settings and your sequence settings?
I posted them under the picture ^^
What is the Field Order displayed when you select the video source file in your Project panel? Upper (UFF)? Lower (LFF)? Neither (progressive)?
What is the Field Order of the sequence?
What was the Field Order in the export settings (it wasn't listed in your first post)?
How do you see the Field Order for the video source file? And what about of the sequence?
Export setting was 'progressive'
In your Project panel: If you select your video file or sequence and hover over it, it should give you a tooltip (shown above).
Note: If you're in Icon view (and you can see thumbs of all your content), you're going to have to hover the cursor over the text part of the thumbnail, not the image preview, to get the tooltip to show.
Outlined in red is the info that I'd like to see. Can you tell me which of these your source video from the camera is, and what your sequence says:
- i UFF (interlaced, upper field first)
- i LFF (interlaced, lower field first)
- p (progressive)
To answer the question about what the lines are. They are interlacing. A throwback to the tube TVs of old, which going by today's standards would be considered 480i. Basically each frame of your video is split up into two images and displayed at two different times with half the lines of resolution in one, and half in the other. So that doesn't sound as simple as I was hoping.
Bottom line, right click one of your clips in the project panel and go to "interpret footage". Under field order it should say "progressive."
Check your Sequence settings in premiere. They should be 1080p 24 fps. Then when you export, make sure that you are using a 1080p format and not a 1080i format.
One of those three places is introducing the interlacing into your video.