As a first step I would update WPML and its addons.
- IMPORTANT STEP! Create a backup of your website.
- Go to "WordPress Dashboard > Plugins > Add new > Commercial (tab)".
- Update WPML and its addons there.
After that, please make sure that you Unregister WPML from WP Dashboards > Plugins > Add New > Commercial (tab)
And then register it again:
- Make sure that you are logged in wpml.org.
- Go to "WordPress Dashboard > Plugins > Add New > Commercial (Tab)".
- Click the "Register WPML" at the right section of the screen.
- Click the "Get a key for this site" link annotated in the screenshot below.
- A new page will open up and the auto-generated key will show in pop-up.
- Copy the key and paste it into the "Site Key" input box annotated in the screenshot below.
- Click the "OK" button.
- Go to your Dashboard > Products.
- Open your original Product. You should see a pencil in front of every translation.
- Open your translation with our Translation editor.
- Edit it and finish it as it is (mark it as 100% Translated).
- Save it.
- Go back to the original page and make a small change, for example, add an extra blank space at the end of a sentence/paragraph.
- Save it.
- You should now see that a circular arrow appears beside the 2nd languages links, this means that an update is required.
- Edit the translation again and save it up to 100% translated.