+3db whenever I bounce a track?

Hi everybody!

After some years using sonar I just realized whenever I bounce a track the new track is 3db louder than the former. The only plug-in I inserted in the original track was sonitus gate, so I disabled (no plug-ins now), set the fader to 0db and I try to make the bouncing again. I compared the two tracks and the bouncing is 3db louder. ¿What I'm doing wrong? can quality be affected by the sonar engine adding these 3db?