Unscrew the 30 or so screws holding up the plastic cover to the ceiling. You will then be able to see the internals of the sun roof. I don't exactly know how to describe what I think might be the problem, but there are these two lines that are hooked up to a motor that move the sunroof back and forth. If those lines aren't mounted correctly or broken, then the sunroof can open and not close.
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