Barrel Hop Up Tuning

With barrel mounted hop ups, I know they have to be rotated on the barrel to set a straight trajectory and get your backspin vertical when you tune them.

For some reason, on one of my M4s I have to rotate the hop up almost 45 degrees to get a straight shot… curves off savagely without it. I know it doesn’t really matter, and straight flight is what you want, but is this indicated a problem elsewhere that I should be looking at?