PDF printed showing text with light grey shading/highlight (but it does not show in powerpoint)

[Lena Le]

Hi Nitro Team. I've got a powerpoint where the background is grey, but the text has no shading. I have tested by printing it from a powerpoint file and it would print looking fine (where text has no other shadings).

Then I converted powerpoint to PDF and after printing it (as a pdf file), the text showed light grey shading/highlight.

On the screen, the pdf file shows the text has no light grey shading/highlight. So why is it printing like that?

I have tried to 'edit' it and see if i could remove shading behind the text, but as it does not show the shading on the screen (only the background colour) there was nothing i could remove.