Ahh, I see. I live in a non-English speaking country, and I'm very used to correspondence where the author has copy-pasted a correctly spelled word from a dict

Ahh, I see. I live in a non-English speaking country, and I'm very used to correspondence where the author has copy-pasted a correctly spelled word from a dictionary, but has used very non-standard grammar in constructing the sentence. I guess that's why I read it as a grammatical mistake rather than a spelling mistake.