Why premiere timeline reduce loud audio by 3dB?

[avpromedia]

I import a sound file into premiere with peak near 0dB.

If I play it in the source monitor, it plays as expected with the peak nearing 0dB.

However, when placed on a timeline and played the entire wave is reduced by 3dB, so it peaks at -3dB.

If I export this timeline the output file also peaks at -3dB.

Is this an expected behavoir?

[avpromedia]

Never mind I found the answer in a previous post.

It has to do with mono panning to stereo.