Emoncms/IotaWatt kWh not matching meter

Hi. My IotWatt using EmonCMS has never matched the reading on my PNM meter. Help please. I have attached a spreadsheet showing the differences. Any ideas why it isn’t accurate? Thanks!

http://irata.com/emon.jpg (spreadsheet)

Iotawatt config:

Few people here know about the iotawatt, I suggest The IoTaWatt forum is a better place to ask a question that is specifically about the operation and use of IoTaWatt. That is managed by Bob Lemaire, its creator, and he and the other users there are more likely to have the specific knowledge to help you.

Thanks, I will post this there. If anyone here can help, please do so.