The following types of originals may not be successfully scanned.
Originals with an uneven surface such as letter head paper
Originals with wrinkles or fold lines
Perforated originals
Original with labels or stickers
Carbon-less paper
Curled originals
Coated paper
Because carbon-less paper contains chemical substances that may harm the rollers, if paper jams occur frequently, clean the pickup roller and the separation roller.
Wrinkled originals may scan better if you slow down the feeding speed during scanning or smooth out the wrinkles before loading.
To scan delicate originals or originals that are easily wrinkled, use the Carrier Sheet (sold separately).
To scan originals that are incorrectly detected as double feeds, press the 
(Double Feed Detection Skip) button before scanning or select Off in Detect Double Feed on the Main Settings tab in Epson Scan 2 window.
When you are using Epson ScanSmart, you can open the Epson Scan 2 window by pressing the Settings button > Scanner Settings tab > Scan Settings.
Labels or stickers must be firmly stuck to the originals with no glue protruding.
Try to flatten the curled originals before scanning.