I don't know if this is a bug. It could be, or there might be a simple explanation.
I was visiting a user's profile because they had become uncharacteristically quiet when I noticed the following. The user's last visit is recorded as being March 17
However, when I visited their answer page I saw the following
Is there an explanation for this (seemingly) odd behaviour? How is it possible to post an answer seven days later without that visit being recorded?