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I'd guess that's the mouse also as BetterRed suggested, especially since it's not happening every time. Logitech mice particularly start to develop an annoying double-click when they start to go bad. Play a game of solitaire or something where there are different actions for a double-click and see if it's happening there too. It gets annoying real fast.
There is a way to take apart the mouse and rebend a spring if it's a very expensive mouse. Otherwise you'd be better off just replacing the mouse once (and if) you've rules out other problems and have pinned the problem down to the accidental double-clicks of the mouse.
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