Someone else's Frndy TV appeared on my box.

Very strange occurrence.  I bought a refurb DIRECTV STREAM box this summer from the Directv Website.   It was completely wiped when received and it went though the normal paces of set up...the trivia questions and all.    I downloaded the Frndly app and set up my account.  A few months later, I deactivated the account.    I was going to reactivate, and went to the Frndly App.  It had someone else's account on it and it was active, with all of the subscriber's recorded programs and account expiration info.    No one else has access to the box so it happened another way, but I can't figure out how.  Anyone have any ideas?