Hi @nani11 ,
Is the scanner connected to a computer?
If so try re-calibrating the scanner and check if this resolves the problem.
Here’s a [https://www.manualslib.com/manual/185480/The-Neat-Company-Desktop-Scanner-Neatreceipts.html?page=139#manual|link] to the section in the manual (is this your model?) that shows how to calibrate the scanner. Scroll down to “Calibrate your scanner” and then click on the ''Next page'' link to view the process.
Here’s a link that shows how to add media to your question on ifixit.
[guide|21499]