I think the issue is some of the repeater entries in the database is set to copy, but the other are not.
Repeater field has several entries in the database. It looks like this:
gallery 2 // number of rows
gallery_0_image 6 // sub field value
gallery_0_description "some text" // sub field value
gallery_1_image 7 // sub field value
gallery_1_description "some text" // sub field value
It’s possible that the first entry (number of rows) is set to copy, so all languages will have the same number of rows. This page should give you more idea about it: https://wpml.org/documentation/plugins-compatibility/translate-sites-built-with-acf/.
I hope this makes sense 🙂
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