Visit log - clicks away to Chrome / IE/ Firefox

I’ve seen this more than once now, and it just doesn’t seem to make sense. I see a person visit a page(s) on my site, then it shows them leaving to a browser download page. I’m looking at one now, person looked at one page, then it shows them going to
Download Firefox — Free Web Browser — Mozilla
and the next one is them going to
Google Chrome - The New Chrome & Most Secure Web Browser
I don’t have links to those places on my site. Can anyone explain this?