Problem with Samsung Galaxy Note 8

Hi.

I have a problem that only happens with the problem with Samsung Galaxy Note 8, in other phones it works perfectly. And that looks gray in the distance, but when approaching it looks good as I show it in the images. It seems a thing of the material of the Unit, but the repeat only happens to me in that phone, in others, that I have tried, it works perfect.
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It was solved using a new version of Vuforia, before using the 7 and now the 8