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To fix it:

First, select your path (use the direct selection tool)

Then, all you have to do is go to the tool that created the path (ie your pen tool) and in the options bar at the top, on the very right is the different types of paths you are creating. Make sure the first box is selected (you probably have the 2nd one selected). Its not the selection that was the problem, its that your path itself was an inverse.