Date is wrong ("created_at" vs "published_at")

I’ve noticed that when you write a blog post with a different
“published_at” date under “post settings,” the “created_at” date will
show up, even though the entry will be sorted with “published_at” dates.
For instance, I retrieved an old blog entry from 2006 and published it
as “2006-04-08”, it will be sorted before all the 2008 entries, but the
date will show up as “2006-11-07.”

Hj Choi wrote:

I’ve noticed that when you write a blog post with a different
“published_at” date under “post settings,” the “created_at” date will
show up, even though the entry will be sorted with “published_at” dates.
For instance, I retrieved an old blog entry from 2006 and published it
as “2006-04-08”, it will be sorted before all the 2008 entries, but the
date will show up as “2006-11-07.”

Does this still happen?

What theme are you using?