If I understand multilingual plugins such as WPML correctly, when you create a version of a page (or category) in a different language, it creates a new extra version of that page.
So for example, you have a page in English, then you create a translated version in Dutch. There are now two versions of that page, one English and another Dutch, and WPML will show either English or Dutch version of that page depending on what the visitor has selected as their preferred language for your website.
So now of course any changes you make to the English version of that page will NOT update to the Dutch version of that page and vice-versa, otherwise there would be no point having the two different language versions of that page, because they are expected to have different content (of course it could be the “same” content just translated but different content nonetheless).
Hope this helps, and if you have any questions about WPML I would recommend that you check out the WPML documentation or ask the support department of the WPML plugin as they will be able answer questions about their plugin much more accurately.