Re: NF 5.5-22 x 56 obj
It's more than likely your eyes. I have the exact same problem, and every scope I've looked through will do it to some degree.
However, the bolder the reticle, the less you'll notice it. NF uses very fine reticles, so it will be much more apparent. Look through something like the SH 3-18x IOR, which has a very thick reticle, and you probably won't notice it.
Something else you could try is the installation of an aperture in front of the objective lens. This will increase the depth of field in the scope, and your eyes will have an easier time focusing on the image and the crosshairs. The aperture could be something as simple as a half inch hole drilled in the center of a Butler Creek flip up cap, or something more elaborate, such as a variable aperture from a camera lens.