<p dir="auto">Ran into an issue with the accordion. When you click on toggle headings too quickly, it doesn't always collapses all the groups properly, in this example, I've clicked on the "Collapsible Group Item # 2" then "Collapsible Group Item # 1", but it opened both of them at the same time.</p>
<p dir="auto"><a target="_blank" rel="noopener noreferrer nofollow" href="https://cloud.githubusercontent.com/assets/1523107/4318543/09a178c4-3f20-11e4-96df-2d0b3465c719.gif"><img src="https://cloud.githubusercontent.com/assets/1523107/4318543/09a178c4-3f20-11e4-96df-2d0b3465c719.gif" alt="bootstrapbug" data-animated-image="" style="max-width: 100%;"></a></p>
<p dir="auto">Using latest version of Google Chrome (Version 37.0.2062.120), probably something to do with transition not being picked up properly.</p>
<p dir="auto">Step 1. Navigate to this page: <a href="http://getbootstrap.com/javascript/#collapse" rel="nofollow">http://getbootstrap.com/javascript/#collapse</a><br>
Step 2. Click on one of the links that trigger opening of the accordion sections (ie. Collapsible Group Item <code class="notranslate">#1</code>)<br>
Step 3. Before the section's opening animation has a chance to complete (the one from 'Step 2' above) click on a different link to trigger opening a second panel (ie. Collapsible Group Item <code class="notranslate">#2</code>)</p>
<p dir="auto">At this point you should see that you have two accordion panels open at the same time.</p>