AD9172 Mode8,9 cannot output waveform

excuse me, I am a student from Wuhan University, China. I am using AD9172 to achieve 1GSPS waveform output. I have the following problems:

the demo project is use as mode 4, and I can change the Data Rate and Interpolations successfully. 

But when I use mode 8 or 9 to product 1GSPS data wave, the output is wrong.

when I use mode 8, DDS 40MHz, the output is 

when I use mode 9, DDS 40MHz, the output is

 and the big wave is 40MHz, the small wave is nearly the hmc7044 input AD9172 clock.

here is my code(mode 9)

hers's my project

Thank you for your answers!

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