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THS4524: unity gain differential amplifier offset?

Part Number: THS4524
Other Parts Discussed in Thread: THS4551, TPS54521, ADS1278

In my design i have added THS 4524 Differential Amplifier for driving single ended input signal to differential output with feedback gain set to unity.

below is an sample reading from the DSO.

Single ended input signal (V) to THS452X Diff. output(V) offset for unit gain(mV)
1.26 0.89 370
1.31 0.929 381
1.34 0.954 386
1.39 1.01 380
1.43 1.04 390
1.47 1.08 390

Why is the THS4524 differential output is not converting my single ended input to expected differential output?

For example 1.25V single ended to 1.25V differential output

thanks

Mani