"Source code" is what the browser received from the server. It can be changed using JavaScript; "Inspect Element" always shows the current form of the document.
EDIT: Again, sometimes things are not complicated. See what I found in the source code:
<li> <div class="textHolder"> <h3>Cardiology</h3> <p><span><strong><a href="#">Cardiac Rehabilitation Center</a></strong> We helped Glade Inc. design their latest fragrance for household perfumes </span></p> </div> <img src="images/temp/slider_img_01.jpg" alt="" /> </li>
Then it is further modified by JS.
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