I wouldn't attach too much importance to the spelling mistakes. Just read through a few threads on this forum (or any other English language forum) and you'll see plenty. Hell, some people even write "should of" and "would of" instead of 'should have' and 'would have' (or should've/would've). Some posters might not actually know but I suspect most simply don't care or don't think it's important. Maybe the person who wrote the texts is the same.