Update: The display on my Jabra headset base also shows a unique time... and not one of the four agree with NTP/Actual time. WTAF.
Monitor 1: 10:20AM
Monitor 2: 10:22AM
Monitor 3: 10:24AM
Headset base display clock: 10:26AM
NTP sync result: 10:32AM
UTC: 10:32AM
None of these are a VM or workspace. There's no DisplayLink. It's three monitors on one video card with DisplayPort -> HDMI cables. One driver, AMD Catalyst. Windows 10. The base station is just USB.
@robryk The would but it didn't appear to be linear, so it lends credence to "something isn't updating the display like it should"