I am having a lot of trouble following the very little you tell us.
How can the image be both "300dpi" and "low res"?
Both your before and after files are mushy and unsuitable for print, they appear to be basically the same. You can't just take a low resolution bad photo and resave it at 300dpi. That does nothing except increase the file size whilst making the image worse by blurring it a bit more.
Can you tell us what the origin of the images was, what format it is, what physical and file size they are and what you did to it?
There is nothing to turn off because I doubt Pages did anything to your image, unless it was in an oddball format which you are not telling us about.
Also why are you taking Pages' files, converting them to an older Word file format to print to a commercial printer?
That is not how you prep files for commercial printing, which I tried to explain to you.
Peter