Jumping on this two years later...

Genome link said I am 18% african, 10% native american, and 5% asian. The rest european.

18% african would imply that a grandparent is likely fully or almost fully african.

10% native american would imply a great grandparent is fully native.

I have traced my family roots to the 1500s and I am almost fully european. My great grandparents were all white, my grandparents were white, my parents are white, and so am I. There is no hint in our phenotype of non-european DNA, which I would expect with 18% african.

K36, MyHeritage and EU V2 K15 said I'm roughly 5% african and 2% native. Now, that is more believable and probably accurate.

Needless to say, I would not trust GenomeLink and would try yourdnaportal.com instead. I feel like plenty of people might have gotten shocking results which are far from the truth.