When I studied journalism I quickly learned that many of the best journalists had ghastly grammar and spelling. They could spin a tale, bring a story alive, investigate, and think outside the box. What many of them could not do, was spell.
That is where subeditors and fact checkers came into the picture. They weeded out all the mistakes before going to press. Nowadays everyone is a journalist. There are no subeditors or fact checkers apart from a select few publications who still have them. Spelling errors are thus very common.