[Q] HTC sensation screan problem

[ales03]

Hello, I am interested If this is normal that when I touch the screen on my phone the image change . This happens when I use the Internet browser and other programs in addition i am ther is a picture of the changes. Is this normal or it is a problem whit the screan

 

[nicky041192]

Normal.
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[ales03]

and why is this normal?