Supposed because in American English they are spelling errors. If the Reply was coming out of the UK I wouldn't have highlighted. Since its out of the USA, it is a spelling error. Just as Labour, Favourite, and Yoghurt would all be incorrect in American English.
Well, I believe we have a support branch that works in Ireland, which uses (British) English. Or perhaps you were being served by a British member of support or the initial form was written by a Brit.