northern brewer refractometer calculation wrong?

I’ve been using Beer Home Brewing Equipment & Supplies for a while, but apparently it has a bug: when OG is 32 Brix, and FG is 17 Brix, it says that the gravity is 1.026, but then calculates the ABV to be 32.858. BeerSmith gives me 15.3, which I assume is more correct.

Can anyone explain? Or do I just avoid nb?  :stuck_out_tongue:

I use Sean Terrill’s excellent calculator at Refractometer Calculator « SeanTerrill.com