My friend mentions that when he uses the PRD on his phone the links tend to jump straight to the bottom of the page. He uses a Samsung.
I have also experienced this on my iMAC when I reduce the browser window so that it switches to mobile mode. I haven't checked all of the pages but most notable and the easiest to reproduce are the links to the Core Classes from the CRB.
All of the links to the core classes jump straight to the bottom.
The exceptions are the links to Bard, Cleric, Sorcerer, and Wizard. these links jump to somewhere in the middle of their respective entries.
For notes in consistency, all of these links have been clicked while scrolled to the the top of the page.