ad7656 used type : parallel , sacle : -10 ~ +10

I used ad7656 to ad convert

In the range of -5V or less, an incorrect value comes out.
When -300mv is input, the value of -6 v is output,
When -1 v is input, the value of -5 v is output.
The input data was both int type and float type.
vref is a 2.5v input, and all 6 channels are being used.

Where should I refer if there is an incorrect setting?

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