Hi Richard,
Thank you for your answer and the info.
I’ve checked what you listed. Everything on the website is up to date. No custom CSS or JS should be interfering and the TWINT plugin developer tried deactivating the plugins to see if it worked, which still wasn't the case.
The link to the website is the following: https://www.mynameisfuzzy.ch and the shop is on the page named “Boutique”.
We would really appreciate your help! Since it seems like the different options aren't the problem, unless I missed something, I’m sending an email with the info to access WordPress as suggested.
Thank’s,
Lea