Wrong login page

Hi there
I use the multirating plugin and if someone wants to write a rating, he/she has to be registered/logged in. Unfortunately, if someone is not logged in, he/she will be redirected to the wp-login page instead of my login.php page.

Thanks to your instructions on this page https://wpgeodirectory.com/docs/redirecting-the-login-page/ I was able to solve the problem partly. As you can see on the attached screenshot, there are two different areas on which a user will be redirected:
1) If he wants to add a new rating, everything is ok. I was able to change the behavior by using your above mentioned function. Link: https://www.blablabla.ch/login
2) If he wants to reply to an existing rating, he will be redirected to the /wp-login.php page. This is what I want to change because no one should ever get to the default wp-login.php page. Link: https://www.blablabla.ch/wp-login.php?redirect_to=https://my-own-page.ch/events/deutschland…

Many thanks for your support!

Best regards
Jorge