Bootswatch symbol in Chrome tab

A strange thing happen to my chrome web browser, and I don't know why, I hope you can help me.

In my chrome tabs the bootswatch symbol appears in the tab icon even when I'm not in the bootswatch website!!

I have already uninstalled the chrome browser using the AppCleaner.app, and I also checked if I had some weird extension installed.

I really don't know why this happens, it is strange. I am programming in ruby on rails and I have browsed and tried bootswatch, but I don't know why this has affected my browser!

Any help?

Edit1:

Even when I search for something the icon is there in the tab

Edit2:

Even in my tablet I have the icon!

Edit3:

If I delete this file: macosxssd/Users/mario/Library/Application Support/Google/Chrome/Default/Bookmarks

or this file macosxssd/Users/mario/Library/Application Support/Google/Chrome/Default/Favicons

It disappear in both devices, but It is temporary. The files are generated again.

Edit4:

Search for bootswatch in my computer: