Views Plugin counts twice when clicking on index page

Hi.

I've trying to setup the views plugin in a website, and I've realised that the plugin counts twice when clicking on index page if you are in other page (blog, porfolio, etc).

I've seen in the grav admin plugin, section Tools-->Reports.

Is this any kind of bug, or I have to configuring anything?

Thanks in advance.

Some screenshots about this bug:

1) Views before clicking to another page (in this case, Portafolio)

2) Views after clicking to the Portafolio page.

3) Views after clicking in index page again: