Hola, Yep, what's happnin'?
I believe that there are some frequencies (~8khz I think) which typically sound like they are above you. Maybe others will confirm that, as it is coming from my addled memory.
Also, at least for two-channel, the 'window to the music' is kind of ellipitical or football shaped, so the image should extend upward if your speaker placement and sweet spot are ideal. I notice the same thing you do, particularly in one system will fairly large floorstanders, the image definitely extends above the height of the speakers, kind of like being front-row, center at the show (which is the goal, after all).
If what you hear isn't artificial sounding or distracting, I'd say you're on the right track. If, on the other hand, it is a distraction, you can benefit from treating your room (perhaps a diffusor panel on the ceiling at the reflection area) or playing with speaker positioning to ameliorate the effect.