If questions/answers (before today) edited, than not showing active line

Question

Recently I found that if Q/A edited (say:Today) than It should be active Today. But It is not showing line:

• Question with active line:

• Question without active line:

Even if it is edited today:

Why it is not showing or is this option not available now?

Note:https://askubuntu.com/questions?sort=active shows question as soon active.

Answer 1

"Activity" is everything other than it being posted.

• Your first has answers from today, edits today and comments today. These all count as activity.

• Your other has only been posted. That activity is implicit.

This is all part of the mechanism that decides what is how the front page is sorted.