Ask question issue..

Hi
Have the following issues:

1. Ask button in FR is not working. See https://www.historicar.be/fr/questions/ask/
   When clicking the “poser one question” (ask) button, nothing happens.
2. Ask button in FR is pointing to NL.
   For now i have added a little js to hack the url to fr

I tried following actions:

• Latest version of wordpress, WPML, woo commerce, AnsPress are installed. I also tried de-activiting all plugins without succes.
• Theme is Avada also latest version.
• disabled all plug-ins -> not working
• switched to twentyseventeen theme but…then i bump on issue no.2

Can you help me with this struggle?
I can give you access