You only thought home sale figures were bad. You ain’t seen nothing, yet.

Reuters is reporting that the National Association of Realtors (NAR) is about to release home sale figures revised significantly downward all the way back to 2007. Why? Because it seems someone was counting sales more than once.

(Reuters) – Data on sales of previously owned homes from 2007 through October this year will be revised down next week because of double counting, indicating a much weaker housing market than previously thought.

The National Association of Realtors said a benchmarking exercise had revealed that some properties were listed more than once and in some instances new home sales were also captured.

“All the sales and inventory data that has been reported since January 2007 is being downwardly revised. Sales were weaker than people thought,” NAR spokesman Walter Malony told Reuters.

“We’re capturing some new home data that should have been filtered out and we also discovered that some properties were being listed in more than one list.”

The data will be released in the organization’s monthly report, published on the 21st of the month.