I am. It seems to be an issue with the logitech setpoint bullshit.
When I disable setpoint, I only get single-page-back actions. However, with Windows controlling the mouse, the forward/back thumb buttons (buttons 4/5 with 4 being father forward on the mouse) are reversed from my preference. In a Windows-controlled state, button 4 (the more forward one) results in a page forward and button 5 results in a page back action. I prefer the reverse of that.
Am I the weirdo here or do others among you use a setup like the one I prefer?
To get my preferred config, it seems that I need to use the 3rd party mouse software and when I enable it, my page jump actions result in two pages per click. Really fucking annoying.