Wbulk, I think you are looking at a valve that's open and the lifter has bled down.
They are others similar in the pics, they probably bled down with lower than normal
oil pressure since at least one lifter has come out of it's bore, and two lifters have internal parts failure.
One can only check lifter preload for each valve when the valve is shut with the the lifter on the base circle of the cam.