LTC2122 odd behavior

Hi 

I have a board populated with multiple LTC 2122 . All of them are working fine except one

If I don't apply signal and receive the digitized data from the ADC I receive 300 - 400 digital level from all channels except one giving 14711 digital level

However all ADCs are receiving same clock and  supply 

I will be grateful if you can tell me why this behavior is there

Regards

Uzmeed

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