Huawei P9 display problems

Hi guys!I just bought my huawei p9 and i noticed very very thin lines across display,if the phone sits in a vertical position.The lines are like fingerprint marks,just straight and from lef bottom corner,to right up corner,and parallels,and only observing if the phone sits in a vertical position.It s not really annoying,but i want to find out if this is a problem or is ok. The lines are a bit thiner than the fingerprint lines.Is this a issue?
Sorry for bad english!

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