1.- Please increase the WP memory Limit. Minimum requirements are 128Mb: https://wpml.org/home/minimum-requirements/
You can add this to wp-config.php to increase WP memory:`
- Add it above the line /* That's all, stop editing! Happy blogging. */
You can double-check the WordPress memory limit in WPML -> Support
2.- If the issue persists after increasing the memory limit, then I kindly ask you to follow these steps:
- Create a new admin user (make sure it has the name and last name added)
- Add it as a translator
- Check if the issue disappeared
note: I'm assuming this issue is only happening when trying to edit the secondary languages, because if this issue happens when trying to edit content in the original language, then it is not related to WPML as our plugins make no changes in the content/behavior of the site in the default language.