bcMeter not (yet) running properly. Reload page in two Minutes. If still not running, run debug mode. 
Further Information will appear. Copy or screenshot and send to jd@bcmeter.org

BCngm3_6 and _12 are rolling averages.
Depending on the conditions, the Graph my fluctuate a lot. Display the rolling averages, then. They are available after minimum 6 or 12 samples taken (default 1hr)