<p dir="auto">Either the <code class="notranslate">sass</code> or the <code class="notranslate">less</code> (which ever is used to print the <code class="notranslate">css</code> in the downloadable package) is making the <code class="notranslate">.row:after</code>, <code class="notranslate">.row:before</code>, <code class="notranslate">.container:after</code>, and <code class="notranslate">.container:before</code> elements twice.</p>
<p dir="auto">show on bootstrap.css</p>
<p dir="auto"><a href="https://github.com/twbs/bootstrap/blob/3.0.0-wip/dist/css/bootstrap.css#L581">https://github.com/twbs/bootstrap/blob/3.0.0-wip/dist/css/bootstrap.css#L581</a><br>
<a href="https://github.com/twbs/bootstrap/blob/3.0.0-wip/dist/css/bootstrap.css#L723">https://github.com/twbs/bootstrap/blob/3.0.0-wip/dist/css/bootstrap.css#L723</a><br>
<a href="https://github.com/twbs/bootstrap/blob/3.0.0-wip/dist/css/bootstrap.css#L743">https://github.com/twbs/bootstrap/blob/3.0.0-wip/dist/css/bootstrap.css#L743</a><br>
<a href="https://github.com/twbs/bootstrap/blob/3.0.0-wip/dist/css/bootstrap.css#L2023">https://github.com/twbs/bootstrap/blob/3.0.0-wip/dist/css/bootstrap.css#L2023</a><br>
<a href="https://github.com/twbs/bootstrap/blob/3.0.0-wip/dist/css/bootstrap.css#L2433">https://github.com/twbs/bootstrap/blob/3.0.0-wip/dist/css/bootstrap.css#L2433</a><br>
<a href="https://github.com/twbs/bootstrap/blob/3.0.0-wip/dist/css/bootstrap.css#L2617">https://github.com/twbs/bootstrap/blob/3.0.0-wip/dist/css/bootstrap.css#L2617</a><br>
<a href="https://github.com/twbs/bootstrap/blob/3.0.0-wip/dist/css/bootstrap.css#L2637">https://github.com/twbs/bootstrap/blob/3.0.0-wip/dist/css/bootstrap.css#L2637</a><br>
<a href="https://github.com/twbs/bootstrap/blob/3.0.0-wip/dist/css/bootstrap.css#L3032">https://github.com/twbs/bootstrap/blob/3.0.0-wip/dist/css/bootstrap.css#L3032</a><br>
<a href="https://github.com/twbs/bootstrap/blob/3.0.0-wip/dist/css/bootstrap.css#L3296">https://github.com/twbs/bootstrap/blob/3.0.0-wip/dist/css/bootstrap.css#L3296</a><br>
<a href="https://github.com/twbs/bootstrap/blob/3.0.0-wip/dist/css/bootstrap.css#L3453">https://github.com/twbs/bootstrap/blob/3.0.0-wip/dist/css/bootstrap.css#L3453</a></p>