Strange thing.. Google Indexing
 

Can someone explain how it's possible?
I got a few sites, 1 in the root of the domain -> domain.com/ and some other subsites in its folders domain.com/site2/ domain.com/site3/ domain.com/site4.com and so on. Each one has a different title with niche name. "Big Tits - SiteName" etc.
And the thing is Google when indexing and listing those subsites took the title from main/root domain site and inserted it as titles of subsites.

How..? why..?