In addition to described behavior many links found in web pages require two clicks. Not necessarily a double click but two distinct clicks. Hovering does not consistently convert the mouse pointer to a finger as usual and getting it to convert consumes the first click. The second click activates and executes the link. 

You should probably file a separate bug for that.  Sounds unrelated.

I am noticing the two page navigation when clicking too.

If I hold the mouse button for more than an instant, the browser goes forward or back one page while the button is held down and another page when I release.  It appears that the button-down event triggers going forward/back in history, and then the button-up event triggers another.

If I just barely touch the button, releasing it as quickly as possible, it only navigates one page at a time, but I think it's because the second event fires before the first one is done processing, so it goes to the page that is already being navigated away from.

Seeing the same thing running 65.0.3325.184 (Official Build) (64-bit) on 10323.62.0 (Official Build) stable-channel sentry with a Logitech MX518 (USB) and Logitech M720 (Bluetooth).

This looks to be a duplicate of  https://crbug.com/821253