I am playing No Man's Sky, my monitor is set to 60Hz, inside NMS vsync is enabled and max fps is set to 60, however when I start the GOG FPS counter with CTRL + SHIFT to open the overlay and then CTRL + SHIFT + TAB to display the FPS it is showing fluctuating numbers in the mid to high hundreds as I am playing the game!

What's going on? Is the FPS counter broken? Has anyone else tried the counter and is it working for you?