What sort of events does "last seen" refer to? For example, how is it that a question was "asked 13 minutes ago" while the asker was "last seen 27 minutes ago"? What happened 27 minutes ago to reset the "last seen" clock? Why does it not reset when a user posts a question or answer?
To blatantly steal a post from @Shog9 over on Meta.SE...
The "last seen" date is only updated every n minutes, where n was 15 [after] the last time I bothered to check.
So when this time is recorded, it won't be updated again for at least another 15 minutes, no matter how many times the user accesses the site during this period.
If I post a question 11 minutes after my last access is recorded, stick around for another 3 minutes hitting Ctrl+R as fast as I can, and then stomp off in disgust... You'll see my profile looking similar to what you observed here.