<p>I can reproduce this with this minimal GPX file:</p>

<pre><code><?xml version='1.0' encoding='UTF-8' ?>
<gpx
    version="1.0"
    creator="osmapi unit test"
    xmlns="http://www.topografix.com/GPX/1/0"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://www.topografix.com/GPX/1/0 http://www.topografix.com/GPX/1/0/gpx.xsd">
    <trk>
        <trkseg>
            <trkpt lat="1.23" lon="3.45"/>
        </trkseg>
    </trk>
</gpx>
</code></pre>

<p style="font-size:small;-webkit-text-size-adjust:none;color:#666;">—<br />You are receiving this because you are subscribed to this thread.<br />Reply to this email directly or <a href="https://github.com/openstreetmap/openstreetmap-website/issues/1209#issuecomment-213846276">view it on GitHub</a><img alt="" height="1" src="https://github.com/notifications/beacon/ABWnLbdaxgndpF0rCH5CO0XUcMsP_CPgks5p6pxMgaJpZM4IOSSy.gif" width="1" /></p>
<div itemscope itemtype="http://schema.org/EmailMessage">
<div itemprop="action" itemscope itemtype="http://schema.org/ViewAction">
  <link itemprop="url" href="https://github.com/openstreetmap/openstreetmap-website/issues/1209#issuecomment-213846276"></link>
  <meta itemprop="name" content="View Issue"></meta>
</div>
<meta itemprop="description" content="View this Issue on GitHub"></meta>
</div>