Descrepancy between $ADV by esignal and barchart

[Kel108]

Just noticed that there is quite a difference in advancing issues today between esignal and barchart for the NYSE. Just want to do a sanity check on perhaps why or if there is a problem with esignals' calculation of this value.
Here is a link to the barchart data - symbol $ADVN - granted its delayed data and I understand each service calculates this but it seems the diff is pretty significant. Thanks in advance.

http://www.barchart.com/chart.php?sym=%24ADVN&style=technical&template=&p=I&d=O&im=10&sd=&ed=&size=M&log=0&t=LINE&v=0&g=1&evnt=1&late=1&o1=&o2=&o3=&sh=100&indicators=&addindicator=&submitted=1&fpage=&txtDate=#jump