Update :
Do you think hrelang : en-FR can cause the problem ?
Why Shopify Translate & Adapt make this compared to en-GB or en-US ?
aboutskincompany.com/en is just a traduction of aboutskincompany.com/ french market, not a new market.
Really weird
I dont think this has something to do with it, but at this point I’m not really sure…
Hreflang is automatically handled by Shopify (unless you ask them to disable it). It works for most, but not all cases. en- is the language and FR is this market. So that makes sense regarding the Markets setup with FR as the market that contains french and english languages.
Sorry for the last answer about French Market. Yes there is only French Market. My previous answer was flagged by the community (hidden post).
And I answered you only today because Shopify block 20 messages for first day of new account.
If you’re interesting, I’ll keep you posted. Thanks again for all your advice !
Would be great to post the answer, when you find it, here. For me - but for the community in general (SEO 
). Thanks!
Hi again, new updates :
It’s confirmed : Google had crawling our test url :
with site:xxxx :
Without :
From Rich Test Results Google :
For more details : https://search.google.com/test/rich-results/result/r%2Fproduct?id=yweqtGnXr9yKeZdziMpGog
I’m going crazy trying to figure out why. Not only for the customer, but this is the first time I’ve seen this. Everything seems clear - JSON-LD, indexing, hreflang, canonical, data-structured, etc…
And I still don’t understand why the landing page “/en” is better referenced than the default landing (FR), via a search in France: type “About Skin Company” and you’ll get the /en. Type “AboutSkin” or “About Skin”, “AboutSkinCompany” and you’ll get the root “/”.
Via VPN Denmark or other, it loads the /en. OK.
But via VPN France, I don’t understand, sometimes FR, sometimes EN.
I think you should take a deep look into the hreflang and canonical setups on the page, and then force a re index 
I’ve had to disable all automatic hreflang on several shops using Markets, and then deploy a custom implementation of it.
Never noticed issues with the prices, but definitely issues with other markets/languages ranking above the primary (or simply the relevant market for the user)
I will try, thanks you. I’ll keep you posted on progress. 
