Now you can see why i hate to use Latex. I've used it a few times, and it always always always gets broken, then fixed, then broken, then fixed, etc., the pain isnt worth the effort. This isnt the only site this happened on either
That's why i mostly use plain text for the formulas, so that people will be able to read them.
Once you've written the LATEX in the editor, click "Ok", click the formula image, and copy to clipboard. Then you can paste it in a reply on the forum.