OK, every word processor these days can check your spelling for you. You don't even need to do anything; it will underline words it doesn't know by magic. Given that big a shove in the right direction PLUS the manual proof-reading that ought to be done, it is incomprehensible that typos get through. It can only be carelessness. This isn't an IRC conversation; it's a professional document.

Clumsy use of English from someone for whom it isn't their native language is a completely different matter, I don't care about that.