My fiancés iPhone 6s screen looks like it is overlapping or the icons have two of them and hey don't line up.

My fiancés iPhone 6s screen looks like it is overlapping or the icons have two of them and they don't line up. he has tried to restart it several times but it hasn't helped... I know this is kind of confusing, if someone can explain to Me how to attach video or photos to the question I can show what's specifically wrong with it. Thanks