Jumpy SD video segment?
 

I have a video I worked on in Premiere Pro (denoising audio, color balance). It is lower frame first Pro Res SD NTSC from U-Matic. When I export it, almost all of the video comes out okay. But there is a particular segment that is "jumpy" in the original, and when this scene is exported LFF in it comes out wrong. It is attached.

When I tried exporting the video UFF in h.264 or Lagarith, it still comes out wrong. If I force Deinterlacing On in VLC, some modes fix this, but then the video freezes during these parts. But in the original Pro Res, the only thing noticeable is that the scan lines jump up and down a little bit, no glitches.

Is there anything I can do?