timing mismach between channels?
LLO seemed to see a very strange issue where multiple channels where displayed shifted in time relative to each other in multiple instances of ndscope:
https://alog.ligo-la.caltech.edu/aLOG/index.php?callRep=46466
One of the plots doesn't show the time, so we can't actually confirm that they were looking at the exact same time. But if they are, then the displays are definitely not consistent.