When you are asking a question - or making a suggested edit - you can see the preview of the post, but not a preview of the title. This does not matter that much on the sites without MathJax - after all, Markdown is not allowed in the title, so the title will be the same as what you see in the edit window.
But if the site uses MathJax, the rendered version can look rather differently. And it is quite easy to make a mistake - one then needs to edit the title again after posting the question (or submitting a suggested edit).
Since it seems that some changes to the editor are planned anyway, perhaps the developers could look at this, too.
This has been requested before on various per-site metas: