Why is the H1 heading not showing on the site?

Question

Joomla

The site does not display H1 headers, they are in the source code, but something prevents them from being displayed in the browser. This happens on all pages.

Answer 1

Yes, everything seems to be displayed, maybe you are prescribing something wrong?

Answer 2

ads... don't see formatting under h1 instead container formatting under heading.

Answer 3

Thank you all for the answers, the reason was found - the site was hacked.