Links not working on mobile version of page
I created a page using a free-form template and activated the mobile version. The links work fine on the desktop version of the page but when the mobile version is displayed, the text shows but they aren't hyperlinks. The page is ProSites for reference. I built them using the rich text component. The coding is:
<p style="text-align: center;"><span style="color: #000000;"><a href="go.prosites.com/Test-Your-Marketing-Knowledge-2w.html" target="_self" style="text-decoration: none; color: #000000;">FourSquare </a></span></p>
Any ideas what is going on and how to fix it?