When Pennsylvania released official data on Marcellus Shale natural gas production last week, there was no mention that numbers from Chesapeake Energy were missing, meaning the bi-annual totals weren't close to being accurate.
 
The firm has been a top producer in previous reports. But energy experts now say such mistakes are a serious problem, and just the latest example of sloppy data releases from the Department of Environmental Protection. Fadel Gheit is a senior oil and gas analyst with New York City based Oppenheimer & Company. On Monday he called the incident "totally unprofessional."
 
But DEP spokesman Kevin Sunday says in a statement that it is up to people who use the data to make their own interpretations.