I realize this is an old thread but I'm having the exact same issue as described when using Chrome.  Anytime I switch from Normal to HTML and back it adds an extra line for that style sheet.  Removing the lines proves pointless as it adds it again anytime you type something in.  This is not happening in any other browsers.

 

We are currently running version 6.3 of CuteEditor and upgrading to 6.6 for $100 is not a valid option for a simple fix.  Has there been minor releases of the editor that included this fix?  One which that we can utilize with our current key?

 

Thanks,

Dusan