Usually this is due to the preset/program having a Wave Cycle Multiplier (wcm) in the settings tab which is the # to the right of the waveform. Since the XM has a limit, a WCM is added to get the frequency to the actual frequency. So one frequency is multiplied by the WCM to get the other. But in this case, the WCM is 16 and it doesn't work out. So there must also be another consideration that I do not see.
For more details, please check the link: