When I sat at this table, the HUD displays were offset 1 position clockwise.
This has happened before, and usually is fixed by disabling the HUD and re-enabling it.
Not so this time.
I unlocked the layout, moved the HUDs into their correct positions, and clicked "Save and lock layout".
This worked, even though the missing HUD never did appear.
Later, a player left, and the HUD windows all shifted one to the left again:

"Leo" is the player who never got a HUD.
I could not grab a screenshot, but I *think* that is mucked card display showed in the correct place.
Is this a known issue with a quick fix?
Thanks,
VS