Found a guy on instagram who builds a custom stereoscopic camera with 4 identical pi cams spaced evenly (about 1 inch (2.54cm)) away from each other on a line. It creates wigglegrams
https://k4mera.world/
It's probably a few milliseconds difference in timing between when the (short) exposure is taken, resulting in different brightness of lights powered by 60Hz AC.
If it’s a lighting flicker issue, you can probably address with frame stacking… multiple exposures from each lens taken in rapid succession, then combined.