There is formal writing, informal writing. Words that are not commonly used in spoken English may often be mispronounced. Common words are subject to drift. T

There is formal writing, informal writing. Words that are not commonly used in spoken English may often be mispronounced. Common words are subject to drift. Then there are regional variations in the US. But then also people move from one region to another. And of course different dialects may coexist.