If the title is showing up bold for you in the list of threads then it means there are posts in that thread that you have not read yet.
If it is not bold then it means you have read or seen all of the posts in the thread.
I think I just figured out what you're saying.
In my picture below, your thread title is not bold like the horses thread title because I have clicked on your thread and red olive of the posts in it.
The bold lettered horse titled thread is bold for me because I'm not clicking and reading all of...
In the future, if you think a thread is not in the right place, just click the report button and mention where you think it should be moved in the report box and let a moderator move it...if it needs to be moved.
Saying something that isn't really helpful just to get it off the list isn't good. It makes the thread really disappear/have an even less chance of getting a helpful answer.