This is what i see as VISITOR here:
and this is what i see as user logged in:
Those "anonymous 52 years ago" are the Posts from Private forums. Have you fixed that in wpForo 2?
I hope that solves the mystery of people reporting here this anonymous 52 years old issue ...
I reported the same fault over 18-months ago, when it started happening on my site. I was provided a fix, that I have to apply after every wpforo update. See here