Corne V3 right side LED flickering

I have just finished a Corne V3 build and I’m noticing a weird effect that seems only visible on the right part that is not connected via USB and solely via TRRS. When I turn on the LEDs, the right side LEDs appear to flicker very fast. It’s as if there is some refresh happening that’s not fast enough for the human eye, or as if there’s an improper connection that would interrupt the current in super short intervals.

I was wondering if anyone has experienced something like this before or if anyone might have an idea of what could be going on? I’m not quite sure how to debug this tbh.

PS: While all LEDs seem to work in the matrix config with via keymap (QMK), I’m getting some lighting related errors from VIA.

Thank you!