Continuing the discussion from Forum Help:
If you notice, under the ‘Activity’ field, There are two columns each with different time amounts. The left side column is when the topic was created. And the right side column is when the most recent post within the topic was posted.
However, I took this snapshot of a topic before there were any replies.
Although there was no other replies at the time, The topic was created ‘12m’ ago, but, whereas there were no replies, the ‘1m’ was when the topic had been edited last.
When your inside the topic, you might see this sometimes. :
Click on the orange number/pencil to see who it’s been edited by.