Having a problem with less pk to pk clock

[toPVR]

we are using AX3DAF1-156.2500T (156.25 MHZ LVDS output) its output with fewer pk to pk than the 250mV clock in the Oscillator and clock offsets to 3.3V, we are routing this clock to CLOCK buffer

 

[FvM]

Please clarify how the LVDS output is loaded and how you are measuring? Specification is pretty clear. Either your operation conditions are wrong or the device is defective.