Vertical lines on odd-numbered pages (1,3,5...) when auto-feed scanning

[osmelectronics]

When scanning multiple pages using the automatic document feeder, the odd-numbered pages will have black vertical lines.
This behavior only appears on odd pages (1,3,5...) the remaining pages are normal.
I have already cleaned the accessible parts of the automatic feeder and the scanning system and the same problem continues.

[Valsimot · Accepted solution]

You have 2 scanners glass to clean one for odd pages and one for even pages. One is smaller glass on the left side when you open a ADF, and 2nd one is on the ADF that is lifted.