Hello guys,
I found out a bug that its happening to me.
After updating to the lastest version of avast free, I realized that all devices running windows 8 or windows 10, dont update their stats unless the computer comes from a restart. If you shutdown and turn on the computer, the stats will not be updated in avast account.
However, the green ball indicating an online stats will show up in both cases (restart and cold boot).
Thanks for your time!