Voice prompts navigating only in English (with accents)

Today I followed a course, the turn promps were all in English instead of the dutch prompts I am used to hear. 

The menu's on the phone (included the Garmin connect app) and the watch are all in Dutch. Settings are set to dutch voice prompts aswell.

I tried to soft reboot the watch, reinstalled the garmin connect app, toggled between different languages, that only changes a dialect in the English language.

What am I missing?