Lady Diana suggested - 'I turned my pedal around where the higher end of the pedal was at the front of my foot.'
This is how I have always used the pedal, no problems unless it moves out of reach. If this is how you use it too, try turning it back-to-front [ to me ] and press down with your heel. It will feel different till you are used to it but may help. Also it has to be comfortably positioned