why do 2 computers have same id


I am trying to connect to my moms laptop. When I ask her for her ID on her laptop it has the same ID as my laptop and I cannot connect. I just logged on to TV for fist time in a few months an all my account infomation and connections were gone. I have had no issues with this in the past. Now all of I sudden I cannot connect to here laptop. We are in 2 different states how are they getting the same number. There is no cloning of machines