To speak of a correct spelling is wrong as there are many standards around the world, the BrE is only one of them. And I also saw the shortened variant—applied in words like colorful—used by many African speakers of the English language simply because they were socialised with media that provided them this standard. To say that therefore, they wrote it wrong because they did not comply with the BrE standard is prescriptivist and therefore wrong.
What I meant to say is that BrE is a standard by itself, such as AmE is. And I am sure that you would find a dozen more standards of the English language, even some that would rather write theater instead of theatre, or center instead of centre; who would more likely eat chips instead of French fries and chips instead of crisps.