Look at the source code of the page (right-click on the page and select View Page Source). You will see something like this:
<p>14 Bluefish Editor</p>
<li><p>VLC Media Player</p>
Notice that you messed up the listing after item 13. Edit the post and you will see that you used a different list marker after 13.
If you want an ordered list, just put any number before each item and Markdown will take care of the rest. If you want a bulleted list, use a + (plus), - (minus) or ***** (asterisk) sign.
On the other hand, I think the following is better:
Here is an image:
Is it possible to make the text before and after new paragraph? In preview, it is, but actually it is not. You can see this post, in my opinion it is not beautiful.