[Resolved] Formatting problem in other language

Can you upload screenshots of where the problem can be seen?

I've enabled debug information for this support ticket. Please refer to this link for instructions on how to retrieve this information from your site and provide it to us: http://wpml.org/faq/provide-debug-information-faster-support/

But first, please check and test the workaround from here if it sounds the same:
https://wpml.org/errata/line-breaks-are-ignored-when-using-the-advanced-translation-edior/

Also do I have to do this hack for all of my already translated pages?
Now that the option “I prefer bigger segments” is disabled, it means that I won't have this problem anymore for future transaltions?

This is a temporary solution. We will address the issue; the line breaks with the "I prefer bigger segments" option will function properly. Therefore, in the future, it will simply be a matter of choosing your preferred choice.

I recommend attempting to update the page translation again. Modify the original page slightly, save it, navigate to the WPML translation editor, and complete the translation.