I guess try to refresh your page, might have been that you were on his profile for 7 minutes and it didn't update the last seen?
I think Abrupt is right, as you may have clicked on a players name sometimes and the little sqaure pop up and you see the last seen there, it might be "Viewing portal index 5 minutes ago" and well, they haven't really done anything in five minutes except for having the portal index open. So he probably just left off from the computer while visiting Liams profile and when he came back, he updated his status the way Abrupt showed. Just a theory.
Lozers, you think you're all so bad. Bruhs, go search up isis terrorists and go cri yourselves to sleep.