White Lines (Won't Go Away)
I am attempting to export content to IGTV, and white lines (artifacting) keep appearing along the right-hand side of the screen (image below). They dance up and down irregularly through each export (differing each time in their pattern), and sometimes disappear altogether through some parts of the video.

I have tried:
- Exporting MPEG instead of h.264
- Ensuring my resolution for the h264 codec is at an even number of lines (806 instead of 803 for example)
- Exporting the video as horizontal instead of vertical (the example photo is this attempt at a fix)
- Using CBR and VBR
My latest export settings are:
Basic Video Settings:
Width - 608
Height - 1080
Frame Rate - 23.976 (matches the source material)
Field Order - Progressive
Aspect - Square Pixels 1.0
NTSC
Render at Maximum Depth - UNCHECKED
Encoding Settings
Performance - Software Encoding
Profile - High
Level 4.1
Bitrate Settings
VBR, 1-pass
Target - 10
Maximum - 12
Use Maximum Render Quality - CHECKED
Use Previews - CHECKED
Sometimes it shows up in Premiere before the export, sometimes only after the export.
What am I doing wrong here? Is anyone else having this issue?