athena-group on "[Plugin: Contact Form 7] SSL conflict When forcing https the form does not display"

We just installed SSL and the contact form does not display anymore when the url is https.
On the web page, instead of the form, there is the [shortcode].
Browsing with http, the contact form appears normally.
Any ideas about the reasons?
Thank you very much

https://wordpress.org/plugins/contact-form-7/