is the footage interlaced? it could be using the wrong field order.
Try deleting the preview files.
How can I Do this?
It is progressive, not interlaced in the least.
Delete preview files
- With a Timeline panel active, do one of the following:
- To delete the render files only for a range of clips, adjust the Work Area bar so that it spans only the desired range. Then, choose Sequence > Delete Work Area Render Files. Those preview files which have any part of their associated clip within the work area will be deleted.
- To delete all the render files for a sequence, choose Sequence > Delete Render Files.
You can set a keyboard shortcut for Delete Render Files and Delete Work Area Render Files.
- When you are prompted, click OK.