Hello,
for couple of weeks my client has problem with Hebrew side of the site.
when he writing new data to specific category of cpt in hebrew. after couple of days the data disapear (could say deleted) from the page front and back.
We noticed also an error message on the pages that deleted (see picture).
we tried to solves that on our own but it keep deleting data.
Thanks for contacting WPML forums support. I'll be glad to help you today.
1) Could you please let me know how you translated the ACF fields? I think you translated them manually, then tried to use the WPML translation editor.
2) It's not related 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. Minimum requirements for WPML are 128Mb. (Kindly check this page https://wpml.org/home/minimum-requirements/)
Add this to the top of wp-config.php to increase WP memory: