Hello,
Thank you for contacting Rank Math and sorry for any inconvenience that might have been caused due to that.
It’s difficult to understand the exact cause of the issue you’re struggling with, without thoroughly investigating the issue.
Can you please share the affected URLs with us? So that, we can investigate the issue further for you.
Meanwhile, you can get in touch with the theme provider and ask them to remove the additional H1 tag from the page, as heading tags are usually added by the theme.
Looking forward to helping you.
Thank you.
Good day,
The url is grads24.co.za
Thank you
Hello,
There are two H1 tags added to the page source.

The heading tags are added by the theme. If you are not adding any H1 manually, please get in touch with the theme provider and ask them to remove the additional H1 from the page as the heading tags are added by the theme.
I hope this helps.
Looking forward to helping you.
Hello,
Since we did not hear back from you for 15 days, we are assuming that you found the solution. We are closing this support ticket.
If you still need assistance or any other help, please feel free to open a new support ticket, and we will be more than happy to assist.
Thank you.