It was added:

Mayo 27, 2018 Lang User Action Key Edit Bargecheh a alternative_titles
Value {"title"=>"Mollys Games", "iso_3166_1"=>"US"}

I try to add the same without the 's' of the end but the software doesn't find it, while before it did it.

Can you please provide a source that the title "Mollys Game" is used officially in any capacity? If you have trouble with your software, you should try finding a solution there. Otherwise there would be hundreds of unnecessary alternative titles added.

I try to add the same without the 's' of the end but the software doesn't find it, while before it did it.

What is the title of the file you are using? Most likely that is the error here since those titles are not in use anywhere.

Could you add as it was added in 27th of may but with this title 'Mollys Game': Mayo 27, 2018 Lang User Action Key Edit Bargecheh a alternative_titles Value {"title"=>"Mollys Games", "iso_3166_1"=>"US"}

Later was deleted by you in June if I am not wrong.

What I'm trying to explain is that we don't add non-existent titles because of users having issues with third party software. I have deleted the incorrect alternative title.

Maybe there is a language issue here since you didn't answer my very simple question:

What is the title of the file you are using? Most likely that is the error here since those titles are not in use anywhere.

Don't worry I will try to contact using Github Radarr's developers to see what is wrong when a parsing is done. Radarr doesn't take properly the title.