Since the magenta stuff also affects the areas which were not exposed (and therefore not developed), I am not sure whether your color developer is the problem. Somehow I suspect that your BLIX didn't work properly. Can you remember what BX1 and BX2 looked like? Was BX2 a clear liquid, or was is milky, with a yellow precipitate?
If you mix a fresh set of color chemistry, and if that new set gives you correct results, you could try reBLIXing these magenta clips.