The Americans have some very strange ways of mangling the English language! From spelling changes like dropping u out of words like colour (look up why the Australian Labor party dropped the u out of labour to get the gist of it) to bizarre pronunciations of a name like Craig (Creg).
Sadly so many are creeping into our language now. So many just use the American default spell checker that the word colour is now often color (even on this website!) and even the word mom is common.