This has been wrong for forever, I fixed it at one point a long long time ago (alog 29798) but apparently didn't put it in SDF.

Anyway, FM4 of H1:PSL-ISS_SECONDLOOP_QPD_SEG filters named 0.4:40 was OFF, it should be ON all the time like in the attached screenshot.  When it's wrong the signal looks noisier than it actually is and is annoying even though it's not used for control and doesn't matter during observing.

I accepted the change in the SDF.