You didn't add any links or anything did you?
You should just paste the text of the URL into the editor and click "post."
I rarely navigate the HTF via phone...but using Firefox and Windows 7 I only see clickable links in post 28516.
I'm going to try and post your first link here:
I'm adding nothing and subtracting nothing. I'm doing what I'd do anywhere else that I want to post a URL -- copying what's in the address bar, and pasting it into a response. In this case, it's staying in text form when I do it, and appearing as the video when you and others do it. What you did right here, posting my link, shows that the system is behaving differently for us.