Login Redirect is not good

Hi
MY site is in 12 languages and each one has a subdomain but all connected to the same wordpress

So a I user comes to the Portuguese page for example:
https://pt.forumnadlanusa.com/2019/07/Voc%C3%AA-compraria-uma-casa-no-bairro-onde-as-casas-est%C3%A3o-e-Rudy/#comments

They want to comment – they are being asked to login and they use social login

I set the return page to be same as the original page

Once they login they are being redirected to the Hebrew domain – which is the main domain with www and not the pt subdomain
https://www.forumnadlanusa.com/?linked=0

And thats it I lost these users because they been steered away from the conversation and they cant comment on the post – they moved to a different page on a language they dont know

How can we solve it so they are redirected to the same page on the sub domain?
Thank you

The page I need help with: [log in to see the link]