Trouble with html link in text widget twenty twelve

I added a widget area to the header and then put the text widget in it and have set it up with social media icons. The only problem is that while the Facebook and Tumblr icons open in another page/tab, the pinterest does not. Am I missing something here?

<div id="social-icons">

<a href="https://www.facebook.com/StrongerWithJenG" target="_blank" ><img src="https://www.strongerwithjeng.com/wp-content/uploads/2013/08/facebook.jpg" width="50" height="50" alt="Facebook" /></a>

<a href="https://pinterest.com/strongerwithjen/" target="_blank" ><img src="https://www.strongerwithjeng.com/wp-content/uploads/2013/08/pinterest.jpg" width="50" height="50" alt="Pinterest" /></a>

<a href="https://strongerwithjeng.tumblr.com/" target="_blank" ><img src="https://www.strongerwithjeng.com/wp-content/uploads/2013/08/tumblr.jpg" width="50" height="50" alt="Tumblr" /></a>

</div>