I am running 168 ws2811 nodes of an output of an ECG-P12X and when I put the test pattern on all lights go through the pattern ok but when the white node (representing output 1) cycles through some of the pixels it makes some of the others go all weird colours. Not the red, green or blue they are meant to cycle through. Initially I thought the pixel that is white when the problem occurs must have an issue. Then I noticed that sometimes the nodes that go weird colours are before the white node. I wasn't sure how a pixel could effect the colour of nodes upstream. Do I have some dud pixels or is there other possible causes. When I let the test pattern cycle through the same issues seem to keep occuring when the same nodes are on white.