AD7172-2 CHANNELREGISTERS

Hi

I have deposited AD 7172 - 2 questions from my customers.

Customer is evaluating AD7172-2. They are using 3 channels from CH 0 to CH 2.
The customer noticed the behavior which he did not expect.
The AD7172-2 occasionally outputs data as follows.
1 ch → 0 ch → 1 ch → 2 ch → 0 ch → 1 ch
0 ch → 2 ch → 0 ch → 1 ch → 2 ch → 0 ch
I and the customer think that this is different from the data sheet.

Is this normal behavior?
Can you give me some advice? Please.
Best regards