I had the same issue on mine when I got it. Adjusted the part (not sure what it's called, maybe striker?) located in the top section of the tail gate. Very easy, just pull the rubber cover and small (maybe 10mm) socket to loosen, moved slightly out. This fixed it. 
Having said that, prior to this I did stuff around with the lower latch part which didn't fix it. Felt like an idiot when I looked up and saw the other part and how easy the adjustment and fix was.
				
			 
			
		 
			
				
			
			
				Gone 05 D3 ARB Front Kaymar Rear Winch E-Diff LRA Tank Dual Battery
Current 2015 SDV6 SE. Tow Pro Mitch Hitch Llams C/motives 70ltr w/tank 2 x comp Traxide BMS-2 x Aux 150w Solar Uniden Engel ARB drawer F/Runner rack Light bar
			
			
		 
	
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