I haven't been able to find a PDF version of the S-1 filing myself to compare. I will note that I'm also using Firefox and headers are aligned for me.
The irony is that everybody bemoans PDF yet formatting control is exactly why it has such staying power despite being such a hated de facto publishing format.
PDF fulfills a need that nothing else satisfies: a vector format that’s universally supported and guarantees that its layout will be the same everywhere, especially when printing.
