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Solution:

When the paper width direction is not aligned neatly

1In the [Finishing: Finisher 2] group of [Adjustment Settings for Operators], select 0701: [Paper Alignment for Stapling: Across Feed] and adjust the width of the paper alignment jogger for stapling.

Use [plus] to increase the width, and [minus] to decrease the width.

1st and 2nd sheets are misaligned.

1In the [Finishing: Finisher 2] group of [Adjustment Settings for Operators], set 0707: [Number of Sheets Align for Stapling] to -1 sheet.