Fonts are not properly scaled when converting xps to pdf

You can either open the xps with evince or use the tool xpstopdf and the fonts are not converted properly. See the xps file attached.internet.xps

The converted pdf file see that the font is out of the square: internet.pdf

See the same when converting to a png file which seems correct.

Here I would like some directions to where to check. Also is there any reason we use cairo directly to render the fonts instead of using pango?