Why would a thread be trending when it hasn't been posted on since March?

[Ninjama1]

https://www.mumsnet.com/talk/am_i_being_unreasonable/4768466-would-it-bu-to-ask-if-its-ok-to-do-this-at-my-daughters-school?page=13

Hi there,
We've asked Tech and everything's working fine. If more people are looking at a thread for whatever reason, up it pops.

Ok thanks.