I think I just figured it out. What frame rate are you rendering to?
For me, I have to render to 30 fps. So I right clicked the 24 fps footage, went to Properties, and clicked, “Disable resample” to avoid ghosting of frames, and that was it. My project properties were set to 30 fps interlaced, and I rendered to 30 fps progressive (by the way, for anyone who would know, I’m making a video for broadcast with this footage, and Comcast’s spec sheet says nothing about making the footage interlaced-am I safe in sending the mpeg file in progressive scan?).
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