It's...the home row for Colemak: http://colemak.com/ At first I thought they somehow figured out how I remapped my keyboard, but it's still treated as qwerty.

Sorry about that - I was working on the CHORDMAK (Colemak-based) version at the same time and forgot to fix it. It's sorted now - thanks for the heads up!

Unrelated but I'm replying to this comment so you will hopefully see...

You guys should add a feature to your website for requesting to be added to a mailing list for information on product development, release dates, etc.