| It's because your HTML is turned on. :3
Whenever the HTML thingers: < and > are in the direction showed, they'll automatically close up thinking you've just posted a HTML code. When you haven't.
The simplest way to deal with this is to turn off HTML in your post, or if it keeps on happening...to just permanently turn it off by going to Account > Edit Profile at the top of the page.
Even if you permanently turn it off, you may still turn it on for a post if you so choose to use HTML codes in a set up post or something of the like.
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