I reported an issue with the external display a while ago, but I can't find the original post.
The external screen was consistently one step behind for everything, including selection, levels, labels, fader pages, and active cue.
On a whim, in settings, I disabled the display, then re-enabled. After that, the screen was perfectly in sync. It's almost like the screen had a buffer that was always one step behind.
I'll follow up if the behavior comes back.
On occasion, I have experienced similar behavior with external displays, I have not been able to reliably reproduce the issue.