From the FCTM
ONE ADR OUTPUT IS ERRONEOUS AND THE TWO REMAINING ARE CORRECT
The ELAC and the FAC and/or FMGC eliminate the erroneous ADR. There is no cockpit effect (no caution, normal operation is continued), except that one display is wrong and the autoland capability is downgraded to CAT 3 SINGLE.
What do you think ? Might be the case for ADR 3 ? Both PFD were consistent...