I don’t really use chrome or auto translations so can’t tell you exactly how, but I know you can set it always translate specific languages.
Translating English to English would of course be stupid, but what I suspect happened is that you first read a article including French (or something that Google thought looked French) and from that point it kept running French to English translation.
If we take the article from your original post and throw it in to Google translate asking for French to English we get the exact changes you noted.