I believe that Ukrainian-speaking person who never had a practice of Russian grammar will do some errors. But such person is a rare phenomenon in Ukraine (where most texts are issued in Russian), maybe you can find some in Canada. I don't have the idea where you got info abut such a "fame".
Maybe you mean that Ukrainian or mixed Russian-Ukrainian speech (and pronunciation) often sounds funny and "provincial" for a native Russian speaker, but it has nothing to do with spelling.