Hi Fabio,
It's a Chrome setting. Open your browser Chrome, on the right upper coorner you have you see 3 small dot of the control customisation for Chrome

click on them. You just open the menu of control and custom. Click on ''Setting''. Then, on the left side of the window you will see
''At Startup'', click on the tab. And in the middle and on top of the window you can choose whatever you want your browser to do when you close and reopen your session. Your setting is on ''restart with a new window''. Close broser and reopen , tadam!
where you left, right? So choose ''Restart