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ADM2682 Receiver inputs A,B

Category: Hardware
Product Number: ADM2682E


I am testing a PCB which has this chip on it and I get weird measurements for the inputs A and B. The lines A,B,Y,Z are simply connected to a connector where a converter is connected and then goes to the PC. It is working fine (some boards have issues with the RS485 but I don't know yet if it is a firmware issue) and I don't know how with these measurements (1ms/div): 

Line A 

Line B

Have you ever seen something like that ?

The lines Y,Z seem normal (not a non-square shape).