As @UserCustomerGwen indicated, those links are automatically generated by the forum to show you other posts/topics that have linked back to the one you are reading.
Are you aware that if you paste a link on a line by itself, the forum will expand it into a boxed preview? Maybe that is more prominent than what you want.
If you don’t want the boxed preview, you can put each link on a line by itself, but use the link function to give it a text name. This prevents the boxed preview, like this:
Green box for motion tagging, Red box for notifications
Notification zone over top of motion detection zone
without having to use the hide details function.
I believe the popular links display is based on the total number of clicks on that link across the forum, not just that topic.