I tried out the Hori pad with Forgotten Worlds and it had the same effect: almost like multiple inputs are being triggered at once. I am not sure which games of mine, if any, support 6-button mode. I was hoping for a controller with a good build mostly for 3 button games (like FW, or games that use the Run button heavily* like Irem HuCards), and maybe street fighter.
Since it only arrived today, I'd like to try to get some advice over the next day or so before I contact market2014 for a return. It's a shame because when set in normal 2-button mode, the controller works fine (and the build is nice). Except... i didn't buy it for 2-button mode!
*my Avenue 3 pad's III button is spotty when it comes to responding to input; I haven't yet opened it up to see if there's an obvious problem that can be remedied.