Languages: English (English )Spanish (Español )German (Deutsch )
Timezone: America/Lima (GMT-05:00)
In WPML > Settings > Post Type Translation, I have set "Forms (metform-form)" to "Translatable, only show translated items".
Now translate your forms at Metform > Forms. Note that your translated forms will have a unique Shortcode. You will need to manually place the proper shortcode on each page in each language.
Languages: English (English )Spanish (Español )German (Deutsch )
Timezone: America/Lima (GMT-05:00)
Please edit the original form, save it again, and then update the translation to 100%.
If this does not solve the issue, I'd like to request temporary access (wp-admin and FTP) to the website to investigate the issue further.
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Languages: English (English )Spanish (Español )German (Deutsch )
Timezone: America/Lima (GMT-05:00)
I would suggest that you first try to translate the form using the WordPress Editor as a translation method - specifically, creating a Greek form in Elementor.
You will then have a Greek form with a unique shortcode that you can place on the Greek page.
After that, scan MetForm for new strings at WPML > Theme & Plugin Localization and revise WPML > String Translation for strings coming from MetForms that would allow you to translate form settings or messages.
I can offer at this step to take another look at the site, if you would like to provide me access again, just make sure first that you have a translated form in the Greek language.
I will leave this ticket open for the next 14 days.
If these suggestions do not solve the issue, it might be worthwhile to use a compatible form plugin, such as Contact Form 7 or WP Forms.
Further, you might consider contacting MetForms and asking them if they have any plans to make their plugin compatible with WPML.