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ADPD105 saturation value


I tested the new ADPD105 board today, and I found a thing that I can't understand very well. 

I wanted to test the max value for one pulse at different situation. In the test I set the number of pulses to 1, and changed the LED current and the TIA Gain. Finally I found the max value is 8319 for one pulse. I don't understand this, I thought it may be 16383, because the ADC is a 14 bit one.

In the following picture, showing two different LED current settings and results applied in slot A.

Would you mind to tell me the reason?

Thank you very much!