PNG transparent background shows when printing

[Limolb]

I have run this this so many times.  I need to put png files on data sheets.  Easy so  Ithought.  I have done this so many times on publisher and now running V 2.5.2.  It all shows perfectly on the screen but when I print it the result is all messed up.  First pic is a snap of the screen display.  Pic is a png done in Photo.   Second pic shows the "transparent" background.  This is camera photo as it has been printed.   
I have changed the contrast to highlight the issue.  This printing issue happens direct for publish, from designer and also from saved pdf of the document.

any help will be appreciated as I have spent about 4 hours on this.  I need to do a new run of data sheets and this is the only issue I am having

 

[Affinity Rat]

It appears to me the background is semitransparent instead of transparent. Try selecting semitransparent pixels and deleting.

[Limolb]

Thanks Affinity Rat for the reply but the PNG was perfect, no issues with it (even ran a red background to double check). I actually finally figured out the issue as it displays perfectly on the screen but not when printed.   It is a printer issue.  Printed on 3 different laser printers and the one on my desk displays the problem whereas the other two do not.   Go figure !!

Printer 1 - HP 2035N mono - problem printer
Printer 2 -Brother HL-1210W - prints as it should
Printer 3 - HP MFP181.... - prints as it should.   

Any ideas on this then.   Not going to worry about it for now.   Am running the latest drivers etc.....