Watch tells me to stand when I've been standing

I use a standing workstation, which Apple Watch clearly doesn't recognize, as it tells me to stand even though I've been standing for the past hour. I've even walked around a bit to make coffee, etc.

I asked at the local Apple Store but all they could suggest was that I shut it off and restart it. Doesn't help. Didn't think it would.

Thinking that perhaps it's the angle of my arm at the workstation that's causing the problem (it would be about the same whether I was standing or sitting at the workstation), I've tried holding my arm at my side as much as I can. Doesn't help. It's especially annoying because I do walk around quite a bit; I doubt I actually stay at the workstation for more than ten or fifteen minutes at a time before taking a walk around the room.

Hoping that this is a problem that can be fixed in a later iteration of the software, as the main reason that I bought the Watch was for the health apps.