Printing tracks lower target db's than expected?

I used Waves DeBreath and reduced the breathing noise. Then I created a Bus called “Print” and a Mono Audio Track called “Print” and sent LEAD VOX to Print and used Input on Print from Print (bus). It recorded fine “printing” the track. It sounds correct. Just concerned waveforms are lower amplitude than original in the attached screen shot. Why? I set LEAD VOX at Zero on the Mixer fader. Tried bypassing DeBreath entirely and output is still 1 or 2dB less. Thanks! Screen Shot here

Thanks all!