The colors on armor are subject to whatever base color they are being overlaid onto. This is why the same dye doesn't have a uniform shade across all armors. From the sound of it, the underlying armor has been changed and it is changing how the dye appears on it.
That might be why it is still showing the black and white dye in the stamped slot. It wasn't the dye that changed but the base texture. From the sound of it, the devs will need to look at the base texture to see if it was changed or maybe if the shader was changed to mute colors too much. I'm not absolutely sure since I don't know for certain how that works in SWTOR.
