I got this weird bug recently: When mouse-hovering the dash panel, the activities overview shows up. Why is that? (I'm using "dash to panel" extension).
I'm using Ubuntu 17.10
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Activities getting activated by mouse hover at the top-left corner is in fact a default GNOME shell behaviour. But in Ubuntu 17.10 it's patched not to do so.
I reckon by installing Dash to Panel (or some other extension(s)/package(s)) you have broken the patch somehow.