Rebellious Light

So I've got one fixture that out of the blue decided to stop cooperating. It always turns on when the console boots up and will only turn off when the console shuts down. When running different cues this one fixture will flash through various different colours before settling on something different from what it should be. I can turn it off directly through the DMX Input, but doing so turns the light next to it green.

After experimentation, it almost seems like the one address is somehow being shared between two fixtures, functioning as both the intensity for one light and maybe the hue for another? Repatching the lights didn't fix it. Has anyone experienced anything like this before?