What if you're a mongrel like me? I suspect they coerce the results into the closest match they can find. But that doesn't mean it reflects reality.
I'm no expert here, but you direct paternal line can only come from one ethnic group, right? And your direct maternal line can also come from only one group too, right?
Regardless of your forebears’ movements around the world and their intermarriages into other ethnic groups, this test will tell you where your father’s father’s father’s father’s etcetera, came from.
Your Y chromosome is inherited in a direct line from father to son, and so it was present in every male that fathered every male that ultimately led to you.
The test will tell you just where and what old Magnus Bonforte was, as far as genetics, which ties to geographic region, physical traits and race, even though racial classifications are somewhat murky or even moot for many, especially those from nations comprised largely of immigrants, or those whose ancestors resided in border regions between distinct peoples.