It sounds like this printer is not equiped with the font files to print your desired font. On many printer models you can print off a list of supported printer fonts from the control panel. I took a look at my nearby m525 but did not see "GE Flow Font" listed under the PCL or the PostScript font list.
The easy work around is to export the print job to PDF and then "Print as Image" from Adobe. This will convert the job into a large image file and rule out any font conversions that could be failing.
You could also try switching the print driver from whatever the default is to PCL or Postscript. One print language may be better able to handle your font than another.
Otherwise you will have to wait for a font file update from HP, pick a different font, or
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