Whatever I and my family members do at 'Home PC' is visible in the history in Google chrome in my 'Office PC'. The two networks are entirely different!
I saw all websites visited on our home PC by my brother on my office PC. I notice it is mostly Facebook and GMail and Google search results.
I do acknowledge that I open my same GMail account in office and home.
What is happening? I suspect that Google is porting our web activities by associating it with my email ID which I open at home and office. But I am not that aware in security.