I think you observe this because of enabled caching. Clear the caches or disable them temporarily. It happens for product edits as well, at least for me, that is.
Also, I have another problem with translations, which is that they are updated (I even see them through PHPMyAdmin in the tables) but still with all caches turned off, the texts in the contact form are not changing from English.
Other texts change, just those in the contact us and some partially translated strings in the cart stay in English. I checked them in the MySQL DB and they are translated, exported the language and they are translated. I have no idea what to do.
I think it is something from my theme Vinova Sport but I don't know what. Also at seemingly random, some of the translations just reset and clear to English and I have to translate them again which is weird and it happened about 5 times already.