Like Mike requests, being able to view the landing page plus keyword combination is pretty key to discovering the low session duration. Knowing what the ad copy is would help as well. Currently though you're dealing with way too small of a sample size of 14 users. Something like 140 users would be more indicative of trends, while 1400 users would be even better.

Aside from the low sample size, the basic reason low time on site happens is because people are expecting something different than what they're getting from a site so they leave rather quickly. Specific reasons it could be happening: slow loading pages, poor design, poor matching keyword or ad copy to landing page content, poor user to content match, accidental clicks, etc. Cheers!

I'm also in the camp of do it if it's so easy. Sitemaps are far superior to meta keywords because they're an actual technical specification of a quantifiable thing (image, page, etc.) versus a subjective listing like meta keywords.

Haivng easily and readily indexed images can also help with your backlink profile. XKCD has a great example of allowing for such promotion here: https://xkcd.com/license.html  Obviously his content is more likely to be shared, but even in your case if it's a little help it's still help and is unlikely to hurt. Cheers!

Patrick's answer gives you a great check list. I'd only add that you within Moz Analytics you can customize the crawler to only report on a certain portion of the site if problems still arise in displaying your data. Still, by using 301 redirection from the old subdomain to new location, cleaning up any old referencing links, and blocking further indexation you should see the errors disappear. Cheers!

Ah, is your embedded blog on a different domain and being iframed in? The analytics would be more detailed looking at the direct blog data. It sounds like something within the blog went mini-viral and is producing the spike.

Thanks for the clarification Lauren. Have you been able to determine if the organic results are news based? Based on the landing pages are you aware of any rankings that might have jumped up recently?  If you can get any insights from Google's Search Console you might get tipped off to some new rankings that are accounting for the spike.

Hello Laruen!  You'll want to look at your direct pages and see if they're getting legitimate traffic in your referrals report: Acquisition >> All Traffic >> Referrals

From there you should be able to get an idea about what recent news or articles that have gone live that have been influencing your traffic. You can also use the Fresh Web Explorer here to see what pages might be mentioning you and sending larger amounts of traffic as well as various tools in Google Search Console (formerly Google Webmaster Tools).

I'm not seeing spikes across clientele so your situation is likely unique to you in that some of your pages have been recently referenced on high traffic sites or has popped into the news cycle. Cheers!

Hi David. The benefits associated with 301 redirection come from either relocating your site, combining sites, cleaning up 404 pages, aligning page names within your site architecture, things of that nature. If you have links or visits to those third level pages and want to house all pages on your root domain instead of third levels, then 301 redirection would be the way to go. Cheers!

There was a nice discussion here on tags: http://moz.com/community/q/wordpress-tag-pages-noindex that still applies. In general they tend to eliminate duplicate content issues when noindexed.

Hi Ram. If Jon's fix above doesn't work, you might want to post the link(s) you're testing with Screaming Frog so that people here can see what's going on and give you specific recommendations. It sounds like there's a 302 in place on the http version of your site, but people will need details to see where exactly. Cheers!

Right. It's kind of a combination of categories you want to rank for and ones that are populated and active enough to rank. Brand C Shirts would be fine, but Brand C Short Sleeve shirts could be too diluted. You're on the right track.

Also, there are some instances where the Moz tool just doesn't align with what you would not consider duplicate content and in those cases feel free to ignore it, especially if those pages are ranking well and performing well in terms of conversion / funnel.  Cheers!