Looking at the dark port camera, I found that the infrared beam looked clippy and also off from the center by half of its beam size toward right in the camera view.

Then I found that the HAM5 had been tripped most of the time today. I untripped it. It looks like GS13s triggered the watichdog.Untripping the HAM5 ISI steered the beam toward the center. The ITMX reflection still looks bit off toward right, and the ITMY is apparently too low by half of its beam size. The attached is the python plot of the trigger event.