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Hi Slumberjac It's embedded in a piece of Javascript which pulls in an image to your site from theirs.  Just ignore it - it has no effect on SEO whatsoever. the only time it could affect is if it loaded slowly. I would not play about with it in an attempt to no follow. Regards Nigel

Sorry - I missed the part about you looking specifically at the Moz crawler. While useful, it's a stand-in for what will actually be used for rankings - namely the actual crawls by the search engine crawlers themselves. I'd be looking right to the source for that info if you're concerned there's an issue, rather than trusting just Mozbot. You can find the SE crawlers data in Google Search Console and Bing Webmaster Tools. Look for trends and patterns there, especially around the sitemap report. The challenge to a Screaming Frog-rendered sitemap is that it can only find what's linked. If the site has orphaned pages or an ineffective internal linking scheme, a crawl could easily miss pages. It's certainly better than no sitemap, but a map generated by the site's technology itself (usually the database) is safer. P.

Thanks Eli! I guess I was wondering if the MOZ Bot only followed pages that were in the sitemap. It was generated by Screaming Frog I have trusted it to include all relevant pages! I have put in a more detailed description in the response below. Overall I need to investigate further but i'm satisfied that the sitemap has not caused the drop!

Has there been any further clarification on this?

Glad I could help! Good luck!