I translated this from German Wikipedia. I hope it is somewhat understandable.

"In gravure jarring is usually recognizable by blurred and sometimes double contours. Here, the error mainly occurs due to wavy paper sheets, unsteady paper webs, non-uniformly aligned impression rollers and faulty unwinding between impression and impression cylinders.

Jarring permanently destroys the rollers and leads to premature plate wear. It can be turned off by careful maintenance of the elevation heights and precise adjustment of the ink rollers."

source: https://de.wikipedia.org/wiki/Schmitz

here is a example of jarring and a true double print (impression).The 1000 Mark stamp is a true double print.

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