I get all of their websites in french (correctly) but some of their emails used to always come in german. I don't speak german, I've never set the language to g

I get all of their websites in french (correctly) but some of their emails used to always come in german. I don't speak german, I've never set the language to german, I don't think I had even visited amazon.de at that point. Then one day it went away. Complete mystery