Sorry to hear of the problem you are having.
Could you please share me the page URL from your site where it is happening so that I can help you?
Also would you mind if I log in to your site and do some troubleshooting? If this is ok then could you please temporary share me your site admin log in details privately by adding them in the box having text “Enter your private content here (only you and forum moderators will be able see it)”?
To resolve the issue please try adding excerpt text manually in the excerpt field of your site home page.
Please find more information about it in the following pages.