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ADC12DJ3200EVM: Working in dual-channel mode, the voltage of one channel's sampled data is reversed

Part Number: ADC12DJ3200EVM


I tried the dual channel mode of ADC12DJ3200EVM with TSW14J56. 

The signal of two channel are 10 MHz +/- clock which displayed in oscilloscope as fig. 1.

fig. 1 10MHz pos/neg clock

Howerver, in the HSDC, the sampled data looks as fig. 2

fig. 2 sampled data of dual-channel

It seems that there exists voltage reverse of one channel. But I couldn't figure out the real reason. 

I hope for your help!