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AMC1203: Input voltage vs MDAT ratio

Part Number: AMC1203


My customer is evaluating AMC1203.

It is described that "A differential input of +280mV produces a stream of ones and zeros that are high 87.5% of the time" on the datasheet.

However they say that 87.5% is reached when input voltage is +250mV on their measurement. 

They're measuring on the following schematic.

Does is have any problem?

Why does output reach 87.5% when input voltage is +250mV?

Should I request them any waveform ?

Best Regards,