They work fine for me which I tested using the latest build of H9 Control on an iPad 4.  I just pressed one of the buttons momentarily as it showed in the video, the button lit up and I was able to add parameters to the expression pedal mapping.  I'm not sure what you're seeing.  If you want to make a video with your phone or whatnot, I'll check it out…  I can't think of any reason why that would happen just on the phaser algorithm…