I see this frequently - if I open a second tab, do some work in that tab, and then try to jump back to the first tab, it'll show where I left off on the first tab but any navigation, etc will mysteriously occur on tab 2. I always figured it must be a Windows-specific problem...?
I've noticed it throughout VW 2018 (I'm currently up to date), and I'm fairly certain that I experienced the same issue on '17.