The U.S. Department of Commerce has determined that wood mouldings and millwork products imported from China are being sold in the U.S. at unfairly low prices. This means these products are sold at less than their fair market value, negatively affecting U.S. businesses. As a result, certain Chinese companies will face dumping margins, including a high rate for companies that didn't fully cooperate with the investigation. U.S. Customs will continue to hold some of these imports and require deposits to match the difference between normal and dumped prices until further notice.
Simple Explanation
The U.S. government found that some wood products from China are being sold in America for less money than they're worth, which isn't fair to American companies. So now, they'll make sure these imports match their real value by having the companies pay extra money.