OpenSans Semibold Normal displayed as Italic
<p>I have problem with Open Sans font imported from Google Web Fonts.
OpenSans Semibold (600) normal is suddenly on all my webpages rendered in italic.
I tried force font-style to normal etc. but with same results. After changing font weight to 500 or 800 it's back to normal style.</p>

<pre><code>@font-face {
    font-family: 'Open Sans';
    font-style: normal;
    font-weight: 600;
    src: local('Open Sans Semibold'), local('OpenSans-Semibold'), url(http://fonts.gstatic.com/s/opensans/v13/MTP_ySUJH_bn48VBG8sNSuY5mlVXtdNkpsMpKkrDXP4.woff) format('woff');
}
</code></pre>

<p><a href="http://jsfiddle.net/q6gszkvt/2/" rel="nofollow noreferrer">JSFiddle</a></p>

<p>Even Google Fonts shows it in italic.
<a href="https://i.stack.imgur.com/a8z0e.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/a8z0e.png" alt="enter image description here"></a></p>