Interesting you mention this.
A mate bought a 1070ti and a Acer Predator 27" about a month ago.
He recently sent me a video of a band down the right hand side of the monitor which changes colour to the rest of the screen. It's like it's a part of a different panel.
He contacted the seller he bought from and they RMA'd the screen for a new one and yet this new monitor also shows the same issue. We've changed everything except for the GPU.
But it could be drivers?
^^^^^
(Only one instance of, it doesn't move across the screen or anything)
Essentially that is an exaggerated example of what happens with the pixel shifting, don't know if it's drivers/G-Sync/panel firmware(have read the same panel is in an Asus G-Sync and it exhibits the same problem), is it the same or different?