Strange Web Template Editing Problem

Hi, I have a master template that I have just inserted the 0ANALYSIS_PATTERN Web Template. I changed the header and footer template web items to use my header and footer templates.

Every time I go back in to edit the master template the editor is adding the following text to the top of the template:

"TODO: Potential Ancestor in TemplateMergeTnT TODO: Potential Ancestor in TemplateMergeTnT "

I have to delete the text each time when I save the template so the text doesn't appear on the web page.

Can anyone tell me why this is being added to the top of my template?

2004s SP10

Thanks, Ken Murray