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DAC38RF82EVM: Why does the amplitude of the output signal get smaller?

Part Number: DAC38RF82EVM
Other Parts Discussed in Thread: TSW14J57EVM,

I use DAC38RF82EVM and TSW14J57EVM, use 811-mod, external input 9GHz@14dBm clock signal to J1 (DACCLKP), connect the jumper cap of JP10. Today, however, the load file output from J6 has a significantly smaller amplitude (from 1200mV Vpp to 20mV Vpp), Why?The amplitude of the output single frequency sinusoidal signal is only 20mV.

1200mV

20mV