Running into a really weird problem with video playback. Prores proxies attached to .mp4 raw from A7siii, 1080x1920 for a vertical show. Proxies play back normallly at Full, 1/4, and 1/8 resolution. At 1/2 resolution, the playback is half as wide as it should be. The other 2 cams in the multicam are Red and the sequence is in RED Cinema editing mode.
If proxies are turned off, everything looks normal, so it's definitely something with the proxy link, and specifically for half resolution.
Images attached for clarity. Really at my wit's end here, so any and all help is appreciated.