Hi Simon,
I just had the exact same problem happen to me. I was shooting a live music vid for a band and didn’t notice at the time. The images u posted look exactly like mine. Very confusing. in some of my shots they only appear with certain colours and at certain angles. It has been really hard to find someone talking about this particular problem.
Did u find a way to fix this in post? or is my first job ruined
thanks mate
Also shot with a7s