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LMX2582: Random phase shift when calibrated

Part Number: LMX2582
Other Parts Discussed in Thread: LMX2594, LMX2820


we employ frequency scan in our application. Every time the synthesizer calibrates frequency, it's phase randomly shifts (180, 120, 90 degrees depending on frequency). There is even no need to change the frequency, just calibrate anew.

It is a problem for us, as we measure the signal phase afterwards. 

Why is this happening? And how can we get rid of it (or at the vey least predict the shift)?

Thank you,