The unusual distortion of AD8031

Dear Sir/Madam,

We would like to use AD8031ANZ for  a unity gain follower.
Pls refer to the schematic. below,

There are description on the datasheet.
/P.14:
Used as a unity gain follower, the output of the AD8031/
AD8032 exhibits more distortion in the peak output voltage
region around VCC − 0.7 V. This unusual distortion  is
caused by the input stage architecture....

/

However,we could not understand the  "unusual distortion".

What kind of distortion?.

Pls give advice to us.

Thank you.

Best Regards,
Kou

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