I don't understand what you mean.
I only found those extra tags when copy pasting html code into html pages in Tiki. Do you mena that?
If you write a wiki page in the wiki module, even using html format (in the wiki module, I mean), everything has been fine for a loooong time with tiki.
I don't know it I got your problem, sorry. Can you explain better?
(or wait until some other user understands better you comment; I couldn't, sorry)