Site in English and Store emails in French... Why ??

Site URL: https://www.costerquentinphotography.be

Hello,

I have my website set up in English and until now, all my emails where sent in English to my customers. 

But yesterday, one customer told me he received an order confirmation in French. He sent me a screenshot. 

How is it possible ?

I never wrote theses emails in French and they are still in English in the settings... Does it have something to do with the new email editor ?

Thanks for your help.

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