" " is the HTML code for a non-breaking space – which looks like a space, but is treated as part of the adjoining word(s) when it comes to wrapping. These characters are pretty easy to accidentally pick up when copying and pasting text, etc. This is particularly true when using the Divi Theme's visual builder, since it adds non-breaking spaces as a way of representing newlines in the text.
You can use the following PHP code to automatically remove non-breaking spaces from within the text content of your text modules. Note that it leaves nbsp characters which are functioning as newlines in place, to avoid affecting the spacing between paragraphs.
Related Post: Adding PHP to the Divi Theme