Documents are not scanning double-sided even when double-sided option checked. Documents are not scanning legal size or leaving an extra space below the documents after scanning.
This issue occurs when you have the wrong driver selected, usually the WIA driver. To select the correct TWAIN compliant driver, select Tools > Settings > Scanner, and select your TWAIN compliant scanner. If you are using a Fujitsu, it will be the PaperStream IP Scanner. Please do not select any WIA Scanner drivers from this list as it is not the proper TWAIN driver.
If you are missing the PaperStream IP option, please go HERE to learn more