AFAIK Steam tracking is only track ur playtime when u r online. So when u disable internet it doesn't track the playtime.
Pretty bad especially for me since I play with my laptop and most of my games are played offline so I turned on the airplane mode to save battery.
Ah right. I don't ever use Steam offline so it's no wonder I've never noticed an issue with it
Bet Shiken that COD would outsell Battlefield in 2018. http://gamrconnect.vgchartz.com/post.php?id=8749702