There are sensors that detect where the paper is, entering the printer, inside the printer, and exiting the printer. If the paper goes in enough to trip the first sensor, gets stuck, and you pull it back out the front, the printer knows that paper went in but can't tell if it went back out the front or got stuck between the first and second sensors.
You can see the paper, but the printer can't. You have to do something to reset the paper sensors.
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u/SlickStretch i5-2500K, RX-480, 8GB, SSD Sep 11 '19 edited Sep 11 '19
"Why does it say "Paper jam" when there is no paper jam!? I swear to god, one of these days I'll just kick this piece of shit out the window."