This is a bug in Ghostscript. It appears if Ghostscript is converting
PDF into a raster format (not into PostScript). For you it occurs
because both the proprietary PPD and the generic PPD call Ghostscript
with the "ljet4" driver, a driver which sends raster data (in PCL 5e) to
the printer.The difference of the proprietary PPD is that the
Ghostscript output is passed through a filter which adds printer-model-
specific control commands (for trays, finishing, ...).

You can simply reproduce it by printing your PDF file with Okular into a
PDF file. This Okular-mangled PDF file is attached. Convert this file to
a PNG file with Ghostscript:

gs -sDEVICE=png16m -r300 -sOutputFile=out.png UNI-ZM1_v-.pdf

and look at it with any photo viewer, for example:

eog out.png

The problem occurs also here.

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https://bugs.launchpad.net/bugs/960989

Title:
  Misplaced spaces on printout on Canon ir 3035

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