A level should tell if the door jam is out of vertical. If that is the case, you can usually plug existing holes with glue and wood plugs, and move the screws in or out a little so the door is vertical. If the level shows the door is vertical, then double check the hinges to see if as suggested above you have self opening hinges installed, if so, buy new hinges and replace. The final thought, is there a draft or fan near the door that could be causing it to open?
Hope this helps.
Our cat opens ours if not latched.......
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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