Can’t update Widget Settings (Checkbox) of ‘Jetpack: Twitter Timeline’

I’m using the Twitter Timeline in a post to show on my personal profile my last tweets.
This widget is providing several layout options. See here code behind configuration:

<label for="widget-twitter_timeline-c47-chrome-noheader">Layout-Optionen:</label>
<input type="checkbox" id="widget-twitter_timeline-c47-chrome-noheader" name="widgets[c47][chrome][]" value="noheader"> <label for="widget-twitter_timeline-c47-chrome-noheader">Keine Kopfzeile</label>
<input type="checkbox" checked="checked" id="widget-twitter_timeline-c47-chrome-nofooter" name="widgets[c47][chrome][]" value="nofooter"> <label for="widget-twitter_timeline-c47-chrome-nofooter">Keine Fußzeile</label>
<input type="checkbox" id="widget-twitter_timeline-c47-chrome-noborders" name="widgets[c47][chrome][]" value="noborders"> <label for="widget-twitter_timeline-c47-chrome-noborders">Keine Rahmen</label>
<input type="checkbox" id="widget-twitter_timeline-c47-chrome-noscrollbar" name="widgets[c47][chrome][]" value="noscrollbar"> <label for="widget-twitter_timeline-c47-chrome-noscrollbar">Keine Scrollleiste</label>
<input type="checkbox" id="widget-twitter_timeline-c47-chrome-transparent" name="widgets[c47][chrome][]" value="transparent"> <label for="widget-twitter_timeline-c47-chrome-transparent">Transparenter Hintergrund</label>

It is not possible to save more than one checked option the same time. When I open the blog posting again I see just one (randomly selected) checked option like it would be a radio button. So I can not hide the footer and the header the same time.
On my example URL you can see the widget is working, because on the same page you can see in the right sidebar another Twitter Timeline without both header and footer.

URL: http://www.itsmf.at/martin-pscheidl/