Why contacts twice?

I have been on my huawei p9lite what's app since yesterday and since then all contacts are duplicated. If I delete one, however, they are both gone somehow. What stupid mistake do I make?

That's because your contacts who also have What's app again and again stored separately.

And how do I get this individually again?

Unfortunately this is not possible.

That's the same with me, is quite normal, because WhatsApp saves the contacts again… So you have to live well now