They do this sometimes intentionally, but usually accidently or as an accepted consequence of the way they handle links into their site.
For example, if I run some ads I want to know what ads people are clicking on so I make a landing page that does nothing more than record what ad was clicked on (known at the time of the click and transition between ad-page and landing page (or site), but lost after that) and then redirect the user to the home-page. That means that when the user then clicks on the “back button” they are brought back to a page that did nothing more than redirect them to the homepage. So…if the page one-back from where you are redirects you to where you are, then…the back button doesn’t work very well :).
There are ways a friendly developer would prevent this.
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