refresh after sending

Hello

The plugin function perfectly for me in terms of shipments.
The only trouble is that the client sees nothing: after sending, it remains on the same page with the sending icon that spins (whereas I receive mail correctly).

How to remedy this?

Page of contact : http://www.gymsante-shop.eu/contact/

Thank you in advance

seb

https://ww.wp.xz.cn/plugins/contact-form-7/