SJ Basic 4 encountered such a problem, no system messages are displayed after submitting via the contact form. The place under them is even visible, and the notification itself does not have the type Message sent. index.php function <jdoc:include type="message" /> in place.

Dear novakrol,

I checked our demo, it shows fine:
prnt.sc/F5mVXMbiYh0i
prnt.sc/UGHAXy3wtH8-

Thanks

I just want to recommend testing the supplied template. This is your demo showing. But supplied to everyone else under a question mark. I do not show system messages in the demo or in the template.

Dear novakrol,

Did you install our latest theme version?
Please try install our quicktart package and check it again.

Thanks

I installed your demo version, you can check that the system messages do not work. Here is the address ferma.76fk.ru/

Dear novakrol,

Your contact page doesn't work now:
prnt.sc/DxNu5adSOUTg
Please try configure your author again.

Thanks