I'm trying to render a 1080 x 1080 video using custom project properties and custom render settings. When I render, there's an extra column of pixels on the right edge where some color "bleeds" into the white space I have on the rest of that edge of the video. These are new pixels that shift the entire video to the left.

I've noticed that this only shows up when playing back in certain video players and not others. The problem is that I need it to display correctly in the video players where it's not displaying correctly. (I want to upload this to a social media app but it displays incorrectly there.) I believe I'm using a QuickTime codec. It displays fine in that player, but incorrectly in Windows Movie Player.

Any ideas of what may be going on and how I can fix it?