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HMC-C070 Output sometimes incorrect in fractional mode

HMC-C070 I am getting mixed results in fractional mode frequency output. On a frequency output range between 6.5GHz to 7.4GHz the frequency outputs are excellent, however if I want to get any frequency between 6.02 and 6.3GHz I get the desired frequency + Ref clock frequency which in my case is 54MHz. And yes the integer value is correct. Same thing happens at above 7.4GHz. Any reason why the frequency adds the reference clock to some of the output values and not others?