Thanks for contacting WPML forums support. I'll be glad to help you today.
1) Please login to this sandbox site and upload the "Formidable" plugin. (hidden link)
After that, please create a test form and translate it to replicate the issue. If the issue is replicable, please let me know to consult our compatibility team.
2) Could you please share your Debug information with me?
You can read a detailed explanation about it here. (http://wpml.org/faq/provide-debug-information-faster-support)
The debug info will give me a lot of information about how your site is configured.
1) Could you please check if the issue persists in a minimal environment by following these steps?
1- Deactivate all the plugins except the active plugins on the sandbox site.
2- Switch to a WordPress default theme like Twenty Twenty-one.
3- Create a new test form and translate it.
If the issue is gone, activate them one by one to see which one is causing an interaction issue.
❌ Please backup your database before performing the above test ❌
2) It's unrelated to the issue, but according to your Debug.info, the WP memory limit needs to be increased. PHP memory is fine, but WordPress uses 40Mb as default. The minimum requirements for WPML are 128 MB. (Kindly check this page https://wpml.org/home/minimum-requirements/)
You can increase it by adding the following code in your wp-config.php file right before the /* That's all, stop editing! Happy publishing. */ line: