Option value (select) doesn’t display anymore

Hi !

My Contact form had been working perfectly until very recently, the selection list doesn’t display properly anymore ; here’s what’s expected :

[select* comment-vous-nous-avez-connu "Choose:" "Facebook" "Twitter" "Newmanity" "Google" "Personal relashionships" "Professional relashionships" "Other"]

… I get only the first element (“Choose:”) of the list appearing on the form, and it is not inside a selection box anymore.

See: https://lifetime-projects.com/en/apply-now/

The only change I made was to upgrade the php version of the server, up to 7.0.14 ; I went back to former version, but that doesn’t make my form work better.

Do you know what could cause this ?

Thank you,

SOpH.