Relocated topic at bottom of new category

I moved a topic from one subcategory to a different one.
When I did that it put that topic at the very bottom of the list in the new category.
It’s newer than all the other topics in that room, any idea why it’s at the bottom?
It went from a private topic to public, but according to this, it should work as expected:

How is the list ordered? By latest activity, by the created date or something else?

Does reset bump date change anything?

Sorted by Activity > Ascending.
Where is the 'reset bump date?

I see. No, that didn’t change it’s position.

I changed it to created descending, then back to activity, and now they’re sorted correctly.