ADF?
Are you using an automatic document feeder (ADF)?
Sometimes a speck of paper or dust will get carried onto the glass as the paper is fed through, and gets stuck and just sits there while the rest of the page rolls by.
Does the distance of the line from the edge of the page match up with the staple holes?
If that's the problem I don't know any way around it except to blow/dust every page before feeding it through.
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