AD5443 input issue

I am using the AD5443 on its eval board. The issue I am having is that it keeps clipping my waveform at the input. When I take the DAC away, my output from my buffer is fine. However, when I have my output go to the vref input of the DAC, the wave gets cut off. It seems like there is some sort of bias at the input that is forcing my wave to shift up. Yes, there is a coupling cap between the buffer and the vref of the DAC.  Am I forgetting to do something obvious? My wave is a 14Vpk-pk (-7V to +7V centered at 0) triangle wave.

Thanks!

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