Have I messed up my SEO?

Selected answers from the Dumb SEO Questions Facebook & G+ community.

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  Jesse McDonald: Maybe the duplicated site wasn’t set to no index? (You can check by doing a site:testurl.com search. If it has been indexed set it to noindex and submit to index in GSC.
  
  Simultaneously have rankings ranked or just traffic?
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  Sean Clarke: No idea if rankings have died as we only look at traffic. We rely on just on page SEO (product descriptions). We sell glass bongs so we cannot advertise (Google & FB will not accept our ads).
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  Sean Clarke: Jesse McDonald ok so site:test.molinoglass.com - did not match any documents.
  
  I guess that is good. I don`t know how to set the site to no-index. But I`ve now put it behind a login and disabled the SEO plugins.
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  Jesse McDonald: Sean Clarke definitely check if your rankings took a hit. If they haven’t but your traffic still dropped then there is another problem (i.e. that traffic was coming from somewhere other than organic search and something happened there). Also, do you have known bot traffic filtered in your analytics?
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  Sean Clarke: Jesse McDonald Comparing Thursday to Sunday (Monday here) and the same days last week I`m seeing an 89% drop in organic search, 47% drop in Social, 72% drop in Direct traffic....
  
  It`s a disaster and I don`t understand why.
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  Jason Hennessey: Sean Clarke - if you are selling glass bongs, then Arsen Rabinovich is probably your guy.
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  Sean Clarke: Jason Hennessey thanks!
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  Tao Ritchie: Sean Clarke
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  Jim Munro: In circumstances like this, it`s sometimes the case that the traffic has not disappeared, it might be still hitting your site but not being recorded. Consider double-checking your tracking to rule this out.
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  George G.: Google has been launching tons of updates in the past month that have hit a lot of people. While I am not saying this is the reason without seeing your site (cos it could just be something technical), there is a chance it is. In which case, there isn`t much you can do.
  
  Do you have google search console for your site?
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  Tao Ritchie: George G. I have a customer site whose sales dropped drastically last week for no reason. It’s been pretty consistent for 2 years and I’ve tested everything. I wonder if these latest google updates may be the reason.
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  George G.: if you eliminate everything technical, your onsite is decent and there is nothing shady in the link profile in the GSC (like spam, blackhat, unknown 301s etc) it was most likely hit by an update.
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  Jane Phelps: Big unannounced algo updates this month. Nake sure your site is technically sound and follow best practices. Was it a health site? If so follow the quality raters guidelines as well.
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  Sean Clarke: We sell glass bongs.
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  Jane Phelps: Sean Clarke that too could be an issue
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  Sean Clarke: I hope not. It`s bad enough that Google and Facebook won`t accept ads for our products, but if Google are going to kill our traffic then that`s really bad!
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  Michael Martinez: It would take nothing short of a miracle for a test site using duplicate content to immediately affect your search referral traffic.
  
  I would look for something else, probably a configuration issue. You may have inadvertently removed some code, deleted something, or something else.
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  Sean Clarke: Thanks Michael, that is what I thought. Analytics live view shows me and my colleagues on the site, yet yesterday it recorded 15 visits despite our other tracking (twitter, shortened urls etc) showing over 100 clicks being sent to the site.