shift clock on AD9102

I' using an AD9102 evaluation board with an AD9914 drived by a 10 Mhz clock for generating a 39.0625 Khz sinusoidal signal.

Reading this signal by an AD7760 ADC drived by the auxiliary output of the evaluation board (10 Mhz CMOS) sometime I note a shift phase between the two system. Typically the shift corresponds on 1,4 degrees in delay that is exactly one clock pulse of 10 Mhz. 

It is possible the lost of some clock pulse input?

The problem increased in case of external noise like turn on near lamps or putting a groud shield on top of the board

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