The problem is that a link like <a href="{{store url=""}}"> gets converted to <a href="{{store url="> and that is a problem (it makes the link much longer and the page seams to be lacking a lot of text.
One solution is to replace the "" (2 ") where the second disappears with ” (2 ‘).
It is probably a very good idea to make this change on all " inside {{ }} to ‘s.
However it is still a good idea to do this change in the code mode of the editor or it will do some of its magic on it.
Better deactivate the Fontis Editor on CMS pages, then it won’t happen anymore and you can still use the basic editing features whilst needed.