@clark713 that suggests its GTK since (IIUC) Emacs uses GTK for its GUI.
If someone has dual boot hardware and has the problem in Windows can they boot into Linux and see if it works correctly.
Also its not entirely clear to me if GTK3 supports hi-res wheels, so if you are using one of those (or a touchpad that emulates one) then that might also be the problem. [This](https://gitlab.gnome.org/GNOME/gtk/-/merge_requests/3839) suggests only Wayland GTK4 supports it (as of a couple of months ago) not X11 or Windows or Macos.