Wonkily arranged Buttons in Pay With a Like Plugin

I’ve selected all four buttons: facebook, LinkedIN, Twitter, Google+. Only four buttons and a full page width to work with.

Problem is instead of all of the buttons arranged neatly in one row (for which there is plenty of room), three of them are spaced wildly across the page and the Google+ button is plopped directly underneath the facebook button. See this link for an example: http://swatchright.com/color-inspiration-farrow-and-ball-24/

Would appreciate direction for how to get this corrected so all four buttons are evenly spaced in one row and looks right/professional.