The levels all look normal. I assume that on the other side you are not seeing any errors at all.
I suspect an issue with the hardware here, either the MX card or the optic. To narrow down the issue you could try these tests or open a JTAC support ticket.
Move this optic to a slot on the MX that is not having the issue and put the optic from that slot here. See when the bias errors occur if they are on the same MIC or if they move with the optic.