Your driver may be the cause of your issue.
PaperScan needs an up-to-date driver (preferably TWAIN or WIA) to work fully.
May I suggest you to follow the steps as describe in this topic from this forum, here: twain-acquisition-issues-t214.html and to let me know if you still encounter this issue with the document feeder and duplex scanning feature?.
This is sounds indeed abnormal however could you provide screenshots of how it shows on your screen. Please describe the specific issue and the process you follow so we can start working on it if it is indeed unintended behavior of the software. If you could submit it by creating a ticket it would be preferable so you can attach the screenshots of the issue and so we may gather more information such as the brand of your scanner as it malfunctionning could be potentially the root of the problem. You can submit a ticket here: https://support.orpalis.com/index.php?/Tickets/Submit
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