Every time I put my iphone on charge the touch screen won't work properly?

Every time I want to use my iphone whilst its on charge the touch screen won't work properly. If I click somewhere it will click somewhere else. The iPhone works perfectly when I use it whilst its charging on my docking station. The charger works perfectly with my iPad. Will someone please tell me what's happened and why it won't work. Also how I could fix the problem.

ITS JACKED go to the aple store

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