Rear gears problem

Im having trouble with my rear gears on my giant anthem x4, it will change up through the gears from the outer cog to the inner cog fine but when i try to change back down it takes a couple of clicks of the shifter and then it will jump two cogs.
Ive tried tightening the cable and adjusting it at the shifter following the guide in the park workshop manual but nothing i do seems to work.
Any advice appreciated
Ive tried tightening the cable and adjusting it at the shifter following the guide in the park workshop manual but nothing i do seems to work.
Any advice appreciated
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B'Twin Triban 5
Simon.
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2012 Spesh Rockhopper