Dell Inspiron 5545 :: Touchpad Occasionally Double Clicks

I just opened my new Inspiron 15 (5545, Mid-2014), and the touchpad occasionally double clicks. When I press the lower left corner, I sometimes get a single click (which is what I'm expecting), but I also sometimes get a double click. If I simply tap the touchpad once, I can get a single click, but I should be able to use the left-click button.

I've checked the Dell Touchpad settings, and I verified that the left button is set to "Click" and not "Double click". I ran the Dell Touchpad test in My Dell, but all it was checking for was whether or not the buttons and touch surface were responsive. It didn't seem to indicate whether the press was a double click or a single click.