Given the situation described in entry 9823, I did more investigations.

It happens that he currently used whitening chassis (JGW-S1808109) does not have a whitening filter board in it, therefore, the configuration switches don't have any effect.

We should replace it by a suitable chassis.

I turned off the eight software anti-whitening filters (AntiWTN) in the OPLEV INPUT FILTERS block and took a payload model safe snapshot. I will turn them back on when we replace the whitening chassis.