Please hover over the yellow light bulb on your screenshot and it will indicate to you that repeater fields should always be set to "copy once".
Please assign this translation preference for all repeater fields and make sure that there are no further notifications showing up when saving the field group.
Then update the original field on the original page, save the page and translate again.
Also, just in case, please avoid setting field groups to being translatable, as this might cause unexpected issues when using our ACF Multilingual Plugin.
I hope the issue can get solved this way. Let me know if further assistance is needed.
Best regards
Andreas
This ticket is now closed. If you're a WPML client and need related help, please open a new support ticket.