Blocking on Facebook?

[Lii.sa]

Well something kind of odd happened to me, I just wanted to know if anyone could explain it.

So, about 2 years ago my friend and I stopped talking to each other and they later blocked me. I didn't really care but it happened. Anyway, now, about 2 years later while I was searching for something else that person came up as searchable. I found this really strange. I thought they must have unblocked me. So I checked on someone else I blocked and that block was also undone..

Does facebook reset blocks after major updates? What do you think happened? Why does blocking someone only seem to be temporary?