On the WPML Job Board I came across a job where a client in the medical industry encountered problems with getting the navigation working correctly.
After doing a short assessment of the issue I discovered that the bespoke theme developed for the client had not been properly internationalised. Apart from that the Translation Settings of the ACF custom fields had not been done correctly either.
Those two issues were the cause of the client’s inability to get the site’s translation from English to Spanish working properly.
After internationalising the theme and adjusting the WPML Translation Settings for custom fields the client was content with a fully bilingual website.
I believe your work is done and I’m very happy with what you’ve done.