It seems like there are two separate issues here. The first is that there are the extra slashes present in the editor code that is on the page.
The second is that it is not retaining your style sheet preference. I would like to look into these issues further with you. Please post back and include the steps that you are taking when you apply this editor to the page and when applying your style sheet. I will do as you are doing so that I can see the same result and help to determine what the problem is and how to resolve it. Please also include info about your OS and DW version.