spacing in font depends on position on the page

Xen list at
Fri May 6 13:39:11 UTC 2016

I find that the spacing between characters of a font will change 
depending on what exact position the text has on the page 

I am sure you are full aware of that.

The question is: shouldn't the spacing within a word remain the same, 
even if the spacing between words would change?

Here is an image:

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