Hi @waffl
It would seem like either acf-qtranslate or qtranslate-x is adding the code and then it gets wrapped with wpautop. I’m guessing qtranslate-x has some code to prevent that in the regular editor but it doesn’t run in ACFs.
It seems there’s a lot of people having issues with the wysiwyg-editor as well if you check the support forums:
https://wordpress.org/support/topic/wysiwyg-not-working-properlly?replies=7
https://wordpress.org/support/topic/wysiwyg-qtranslatex-editor-is-multiplying-content?replies=7
I think it’s something that needs to be fixed by either acf-qtranslate or qtranslate-x. ACF supports WPML out of the box and if you’re up for switching Polylang is a great free alternative. I’ve used it myself with ACF on multiple occasions 🙂
https://wordpress.org/plugins/polylang/
