I've noticed that in the list of cached pages under wp-cache there is duplication of my home page. I'm worried that this this might also mean that Google is picking up my home page as being duplicated.
In order to avoid duplication I use the Permalink Redirect plugin to redirect all URLs ending in a slash to the version without the slash. (I'd noticed that in Google Webmaster Tools both versions had been showing up with their own stats).
As it happens, both URLs that are showing up in the file list have the trailing slash:
They have different cache times so it's not a display glitch.
Anyone have any idea what's going on and how to prevent this duplication?