Mexico?

The oddest thing that has come out of my DNA matches is a link to several family trees that are almost entirely in Mexico.  And these are not distant cousins!  They are 4th cousins with a "very high" degree of confidence!

I cannot explain it.  One of those trees is also linked to the Allen ancestors, which is even more mystifying, though Augustus Allen lived closer to Mexico than anyone else in the family.

If you look at my DNA Ethnicity report, it shows that 10% of my genes come from the Iberian peninsula. That could explain any Spanish blood, but it would have been much further back than 4th cousins.  

Wondering... (I do a lot of wondering)....