URL link is wrong for user

My wordpress blog has a link to an author. But it’s wrong. I’m not sure how to change is, as it’s automatically done by wordpress. Could someone help please?

Eg. On post https://blog.mummybrain.com/2013/05/making-a-volcano.html you can see the author is Mrs K. The link it goes too is https://blog.mummybrain.com/author/Ms%20Kate which comes up with no content found page. I’m not sure what the correct link should be – or how to change it.

Thanks in advance.