Mountain Lion, Tap to Click and Two Finger Scroll Problems
This seems to be an issue with your trackpad not registering everything correctly, or a very slow computer. A way to fix this, but you would have to change the way you bring up the context menu, is to open System Preferences, navigate to Trackpad > Point &amp; Click. Next, you can either disable it by clicking the checkbox next to it, which means you would then have to Control+Click for the context menu. You can also click on the down arrow next to "Click or tap with two fingers" and select one of the other options. Sorry there's no real solution to your problem.