Multiple language surveys - help needed


Hi there,
I have chosen the dashboard option to add multiple languages to the survey. My problem is that I enter the translations and then click on “save changes”. I get a confirmation that the changes have been changed, and if I use the Prev/Next button, it shows the translations I’ve entered. If I go to “preview”, however, some of the translations show up, some don’t. When I go back to “manage translations”, the translations I’ve just entered and saved have partially disappeared. Not all, just some. Any ideas what I’m doing wrong?