NetBSD installation doesn't like keyboard

Has anyone ever experienced the NetBSD installation screens accepting what seems to be two keypresses from console when only one is made?

In this case, if I press return (Type4 or Type5 keyboard), it moves to a submenu but then somehow assumes I've pressed enter again.  This happens at the first Install menu (menu choice A to install NetBSD from scratch).  It goes to the next screen which asks "are you sure" but "No" is highlighted.  Suddenly it jumps back to the main menu again as if I answered "no".  Some menus don't do this.  The reinstall option doesn't do it but the distrubtion sets underneath do.

I'm not sure why it's behaving this way but it's certainly making it hard to install.