Onkyo receiver volume problem?

I have an Onkyo TX-SR707 av receiver, Emotiva xpa200 for the fronts, and as I turn the volume up, once I get to about -2 the volume just stops getting louder. But the number keeps going up to 12. Its not even that loud. I feel like it definitely used to be louder than this in the past. And this doesn't happen if its in Stereo mode. Every other surround mode, this happens in, and in Dolby Pro Logic II it stops at -5.