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Help Solid Grid Line appears when i swipe my finger on mobile screen

Good Day all,

I need your help for my below problem,

I've an HTC One M8 since 7 months and everything is OK
then i bought a dot view cover and used it for 3 days without screen protector

I noticed that the cover is leaving grid line on the screen but when i clean the screen it returns back to normal

but after 3 days i noticed that there is a white grid line appears in the middle of the screen when i swipe my finger horizontally and when i rub the screen it totally dissapear and returns back whenever i swipe my finger again over this part, i noticed also that if i rub the line utill it dissappear then put a screen protector i find that the line doesn't come again, may be because there is no direct contact between my figures and the screen ,
so the line is appearing by direct swipe over this part of the screen and disappear by rubbing

Any ideas for help ??
 
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