Cannot fill fields

I’ve been using Contact Form 7 since several years on multiple sites and have nevers had any problems. But yesterday, one of my clients advised me that there was a problem on his site. The fields are not fillable. I tried creating a new form, but the problem remains.

I don’t know since when the problem appeared as this is a very small business. The last time the form was actually used was about 2 months ago and it as still working fine at that time.

Here is the link to the form page:
https://www.jpbernardguide.com/contact/demande-de-renseignements/

Any tips you might have to solve this will be most welcomed!