No OD effect in headphone output

Ive been really enjoying the QC and am getting pretty familiar with the interface. Great effects and Amazing tones through my Vox AC30. Through the amp, the guitar level and effects sound great.

I have several fairly simple presets configured with:
In 1 (Guitar) with OD block, Delay Block and Tremolo Block all routing to Out 3
In 2 (Vocal) with reverb / delay blocks routing to Out 1

I just tried using the headphone output with my Shure IEMs. The vocal volume is loud and clear, but I noticed my guitar sounds fairly low in volume, and the overdrive block isnt coming through the headphones. The guitar sounds clean, but other effects like delay and tremolo seem to be working.

Is there a hidden setting or routing configuration I am missing?