HomePod Volume Control Bug (Airplay)

Hi,

I'm enjoying the sound quality of the HomePod but there are quite a few bugs. Specifically the volume control when using airplay from iTunes on my Mac or PC seems to have a bug.

I play music and choose the zones to output to, one of them being the HomePod, the others are AirportExpress zones. If I attempt to change the volume via the HomePod it changes the volume globally or rather it brings the volume globally down to a lower level (of what the HomePod is currently set to?) then I'm not able to change the volume unless I either walk over to the Mac or PC running iTunes OR I use the remote app on my iPhone.

Hopefully this is fixed soon because is it's a pretty annoying/showstopper bug and kind of defeats many of the "helpful" purposes of the HomePod.

Thanks