When I replaced the hatch struts on my car I messed up and had one of the brackets reversed which caused the hatch to do exactly what you're describing. Double check the strut brackets to make sure they're on correctly on both sides. Also there are rubber bump rests that are adjustable, make sure they aren't spun out too far. Twist them all the way in and try closing the hatch. If that doesn't help, remove your struts and see if the hatch will close without them. If so, they're the problem.
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