magic mouse double clicking with single left click
Recently my Magic Mouse has been registering a "double click" when I only left click once.
iMac (21.5-inch Mid 2010), OS X El Capitan (10.11.5)
How long have you been ugraded to El Capitan?
Go to ystens Prefs > Accessability > Mouse and check the settings. Because El Capitan has its own mouse, MM2, older mice sometimes don't fully function.