D'oh!
I just tried it out again. When I looked through it with my right eye same story, but with my left eye it was OK. I have always thought I have an astigmatism in my right eye; I guess it is worse than I knew. My Aimpoint reticle looks like a star instead of a dot.
Off the topic (if that is possible, since this is my thread) but is an astigmatism correctible by Glasses or surgery? This sucks.