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Query on ADC evaluation Board working

Category: Hardware
Product Number: DC2395A-C
Software Version: PScope

I am using pseudo differential unipolar input circuit configuration for ADC in DC2395A-C board. In datasheet of LTC2325-16, the plot between AIN and output code is mentioned as attached. I am using eval board in default mode (i.e Vdd=5V), where internal reference for ADC is 4.096 V. But max code of 32767 is obtained at 2.048 V itself. It is giving the codeword of 7233 for 2.5 V input again. Hence, it is not showing linear relation for AIN and code generate for ranges of input volt between 0 to 4.09V. Could you plz clarify on it ?