Natalie Watson

When a user edits an article using a Mac, some styling code is added into the source code automatically. It doesn't display any change in the editor for either Windows or Mac users. But on the published article, it changes the formatting. The text displays correctly for Mac users. But for Windows, the formatting of the text is different. The only way to resolve it to edit every line of source code to remove the styling. How can we fix this please??
This is what is added...