Yes exactly. Unfortunately, I did a lot of things on the site. I updated plugins, theme, installed new plugins (WooCommerce). I remembered now that I was adding code to functions.php. Code that disables the address fields when a customer buys a virtual product. I’ll check it when I’m at the computer.
I also changed the database password.
I have a backup from April 14. I restored plugins files from this copy yesterday. After that, two subforums appeared in each parent forum.
I will continue working today.
