Origin of Ashkenazi DNA percentage question - Thank you #dna

richard may

Thank you to everyone who replied to my question below!
There seemed to be no consensus among the answers.

Richard May @MayTzu
North Carolina, U.S.A.

I have 1 known Ashkenazi great grandparent of 8. One eight is 12.5%.
According to 23andMe, FTDNA, AncestryDNA and MyHeritage DNA
my DNA is about 20% Ashkenazi. All agree on this. This is 1.6 times
more Ashkenazi DNA than I can account for genealogically.

Is it more likely that I have an undiscovered ancestor with Ashkenazi
DNA, who perhaps assimilated, or that I simply inherited more than
half of my grandparent's Ashkenazi DNA?