The paper printed has its corner folded

[Joe348]

I  was printing double-sided and the corner of the paper printed was folded, and this happened to every piece of paper printed.

[Dragon-Fur]

@Joe348 

Welcome to the HP User Community.

Unfortunate and perhaps due to

• Dirty printer
• Printer misalignment  
• Weird paper (too damp, too dry, curled, too thick, too thin, wrong for the job)
• Wrong settings for the job - not "wrong" enough to cause job failure
• Combination of one or more issues

Known solutions here:

Start with this one...

A 'Paper Jam' Error Displays

and

Out of Paper' displays, printer does not pick up paper

and

Alignment errors

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HP ENVY Photo 7820 All-in-One Printer 

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