Tearing across screen boundaries on RTX A4000 with mosaic

I have a setup with a Windows RTX A4000 (actually 3 A4000s but we’ve removed two for debuging) and mosaic in a 3x1 (stacked vertically) configuration. Each monitor from bottom to top is one frame behind the other. So the bottom monitor is realtime, the middle monitor is a frame behind and the top monitor is two frames behind. This happens across all applications. Vsync is on globally. I’ve tried the most recent drivers I’ve tried the oldest drivers. I’ve removed all screen cap / remote management software. I’m pretty at a loss as to what to try here to get rid of this tearing.

Any ideas?

Follow up: the issues seems to be with the monitors we are using.