you are correct you should only have one canonical tag on a page Max

Because you're using WordPress Yoast SEO plug-in I can tell you that it automatically adds canonical URL for you when you are modifying thing that should be pointing somewhere else you have to go into the advanced area in the photo below.

So all of these URLs would show the same content:

• http://example.com/wordpress/seo-plugin/  you would want to point them all to the first URL  via canonical
• http://example.com/wordpress/seo-plugin/?isnt=it-awesome
• http://example.com/wordpress/seo-plugin/?cmpgn=twitter
• http://example.com/wordpress/seo-plugin/?cmpgn=facebook

for more information on how to use that plug-in and remember only one per page and if the page is duplicate content pointed to the page that you want Google to assume is the owner of that content.

If you get stuck ask me or reference this below.

https://yoast.com/rel-canonical/

All the best,

Tom

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Look at your source code on these pages use command-F (on Mac) or control F (on PC) to search for the term "canonical" if you do not see it more than once on the page it should be no issue.

"the only difference I can see is the first one uses '...'  and the second one uses "..."

The canonical link? If there are two canonical bags on the same page make sure to remove the one that is not pointing to your preferred page or make sure the canonical is self-referencing. But make certain there are no more than one canonical tag like this below

Look for

Also, I would use

• https://www.deepcrawl.com/  allowing free site crawls right now
• and/or
• https://www.screamingfrog.co.uk/seo-spider/  free up to 500 pages.

Just to confirm you do not have duplicate canonical's both tools will let you know for sure is will checking the source code of the page that is flagged.  if it does not have duplicates I would report it to The Moz they are awesome at getting back to you and answering these types of issues if there is in fact only one canonical per a page.

I hope that helps,

Tom

If you want more information yes  Apache server does make

Most Apache web servers have set the following pages as the default page with a directory.

default.htm default.html index.htm index.html index.php

If using WordPress you could see index.php because WordPress

Uses a PHP Database regardless of what your friend told you ideally you should have

Properly 301 redirected static links when talking about links that are going to be seen by Google.

this

Means WordPress websites ideally should not contain publicly visible index file of any kind.

To cut to the chase I have cited this response from Matt Cutts, the head of Google’s web spam team. to Yoast

Referenced from http://yoast.com/wordpress-seo-url-permalink/

I emailed Matt and asked whether it makes sense to add .html for systems like WordPress. His response:

In general I wouldn’t. My WP has urls like http://www.mattcutts.com/blog/remove-result/ and that’s pretty ideal.

So. Case closed.

Should I add .html to my permalink structure?

A good collection of resources. Are posted as links below this line.

Use Yoast http://yoast.com/wordpress/seo/

Is an excellent source of WordPress knowledge I strongly recommend using the Yoast WordPress seo tool the reason a side from being one of the very best Word press plug-ins that enhance your Word press site this one uses

http://yoast.com/change-wordpress-permalink-structure/

http://yoast.com/wp-content/permalink-helper.php

If you need to make changes to your link structure A great

resource I understand redirects is the link under this line

http://24ways.org/2013/url-rewriting-for-the-fearful/

If you need to redirect an index tag using Nginx

http://winginx.com/htaccess

http://moz.com/blog/htaccess-file-snippets-for-seos

http://codex.wordpress.org/Linking_Posts_Pages_and_Categories

I hope the two links below will give you the information that you are looking for. I believe that you will find quite a bit from the second link and the first link will give you a free resource and finding exactly how many links pages have been indexed as far as how many have not you can only find that using the second  link

http://www.northcutt.com/tools/free-seo-tools/google-indexed-pages-checker/

along with

http://support.google.com/webmasters/bin/answer.py?hl=en&answer=2642366

Go to advanced and it will offer you a show all