Now, I don't know if it's just me, but when I click someone's username it says they've been gone for 3w and 4d, it happens for everyone, even people I KNOW have been online. I don't know if I this is a known bug or anything, it's just weird.
Is the date on your phone correct? I had a similar issue a while ago, multiple players showed "Last activity in 1h 59m" because my PC decided to use a different time zone.
Rip, for some reason my time switched on my phone ahead 3 weeks, I don't know why, but I fixed it, thanks.