Why does green lines pop up on my phone

A

AC Question

Okaybso wjen i type green lines pop up on my phone and than when i dont type theres black line

Okay so when ibtyoe free. Lines pop up on my phone but when I don't type theres black like I won't to no whtd wrong bce this is the first time this happed to me
 
A

AC Question

Okay so when i type something green lines pop up but when I don't black are on my screen what happing this is the first Tim this happend to me please help
 

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