Please make sure you do not have sample drift issues, and your sample rate is set to 44.1 kHz. Changing the measurement signal type in the Settings menu of the measurement app can also help.
Sometimes if you have unordinary reflections in your room, or if your display is in front of your speakers, the software becomes quite picky how you place the microphone. Feel free to move the microphone around the midrange driver a bit until it measures correctly. If the measured distance is within +/-10 cm (4") then it is ok.
If you are unsure about this, please submit a request here.