[Zope] URL is missing up in Zope

[Stuart Foster]

I've noticed that sometimes as I traverse my Zope sight the URL keeps
growing..

For instance
The main folder has an index_html
  mainfolder->index_html

A subfolder doesn't
  mainfolder/subfolder

If the index_html is accessed from the sub you get the mainfolders
index_html as I expect to.

However if I traverse the two folders sometimes the URL looks like

mainfolder/subfolder/subfolder/subfolder/index_html

Why..

Thanks