ok so, I reproduced it with a new blanc project :
create a LKG camera
select the quilt viewer (in "lightfield window" tab)
deactivate the "lightfield window" button and reactivate it
the live view is now upside down.
has I said not really a problem has any action, switching back to viewport view, or selecting the quilt viewer button agin (with thooses steps it was still selected) ot will jump back to normal.
``but it is surprising when it does it just after a render and your fireplace is upside down ^^ (couldn't recreate it that way)
A user on discord reported that sometimes rendered holograms are flipped: