there still remains a more common reason for strange tracking behavior of your mouse, and that's a corrupt preference file that your Mac uses to configure the Magic Mouse when it's first powered on.
you can either try removing one at a time and then seeing if the mouse starts behaving, or you can remove all of them at once, sort of the nuclear option; get rid of all of them, and let your Mac rebuild the preferences.
| Preference File | Used By |
|---|---|
| com.apple.AppleMultitouchMouse.plist | Magic Mouse |
| com.apple.driver.AppleBluetoothMultitouch.mouse.plist | Magic Mouse |
| com.apple.driver.AppleHIDMouse.plist | Wired Apple mouse |
| com.apple.AppleMultitouchTrackpad.plist | Trackpad |
| com.apple.driver.AppleBluetoothMultitouch.trackpad.plist | Magic Trackpad |
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