Translation of a field overwrites the original language value I have encountered a problem with translation. When I try to translate a custom field of a custom node type it overwrites the original value.

Here is how it looks like

The custom field


I create a node and enter following information 



Then I click Save, the node appears, so far so good.

Next I click 

 

I can see that translation not available now, click Add



Then I have the following url link 

/node/8/translations/add/en/&lt;my language&gt;


Enter the following value



Now I have two nodes.



Let go to the original node and see what is the value of the field.



It is the same as it was before, but on the web page, I have two nodes with different translations.

The interesting thing that both of the two nodes in admin panel have the same translation as currently selected language, even if I click the edit button from the Translate tab, I need to switch the language via a switcher for example to get the content of a node for the selected language.

And that makes me crazy, I cannot understand what is going on really, how can I edit a translation of a node without changing the language ?

Please help me to solve this problem, I am completely lost with this stuff.

P.S.

Database entries are added correctly I guess



EDIT

My detection configuration before 



And set it like this now



Logically, I guess the Interface Language should be responsible for translating Admin Panel interface and other helper popups that are used for the development purpose. But Content translation should be exactly what I am looking for, but when I switch off the Interface Detection and leave it to by default (uncheck session), but check Session in the Content translation section, my language switcher disappears.
I suggest looking and experimenting with the following settings:

admin/config/regional/language/detection

You can also check if the checkbox "Enable interface translation to English" is checked. That may cause this problem.
admin/config/regional/language/edit/en


Question : One thing didn't become clear for me:
"It is the same as it was before, but on the web page, I have two nodes with different translations." - what is the url of the web page. Is it a page constructed with views, panels, or just node/nid ?
Regards,
Oleg