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seoelevated is correct. Reference example from Google here: https://support.google.com/webmasters/answer/189077?hl=en

Thank you. Do you think that a normal fluctuation can last more than one month? And what do you meas with "I would add more "readable" content"? Can making the texts currently hidden visible help the ranking? Thank you.

Yo Jo, Social visits for multiple Moz campaigns all show "0". I've checked GA which shows social visits from Twitter, Stumbleupon, etc and I've checked that the GA number (eg UA-42970474-1) is the same in the Moz campaign. Why is Moz not showing some of the social visits GA is reporting? iVhAV

I just browse via Google.IT for "vangogh" and you're on N:2 spot after Italian Wikipedia article. I strongly recommend you to create account in SearchConsole and verify your site. There you can see in SearchTraffic exactly what position you get in SERP results. Now answer for browsers - modern search engines return SERP pages optimized for specific browsers. That's why it's possible browser X to see some results, browser Y to get other results. There is no way to escape this unless you change "user-agent" string in browser with some plugin. Some engines are even going further that return personalized results based on IP, previous searches from this IP, previous searches from this account, previous clicks on SERP, etc. The only way to get right position is with SearchConsole or special tracking tools as Moz RankTracker. And there you can see "average position".

Hi Peter, in this article it talks about a simple depending on users localization redirect, in the same domain. In my case are two domains. the first www.sea-aeroportimilano.it with a redirect 302 to a landing page in italian or english in another domain (www1.seamilano.eu/landing/index_it.html). I would like to follow the google guide lines for redirection and to set a 301 between www.sea-aeroportimilano.it and www1.seamilano.eu/landing, and after that a 302 for the language. Of course I will add hreflang for IT and EN. What do you think? Massimiliano

Other traffic usually includes traffic that Google can't pinpoint, like referral clicks from no follow links, some clicks from Bing PPC, things of that sort. It is not usual for it to include traffic from AdWords. Google wants you to be able to analyze that data because they don't want to discourage you from spending. If you want to be sure, make sure that your analytics code is correct, and maybe implement some of the conversion tracking tools in AdWords. Here is some detail on that.