Post Title is too big and is repeated

My topic title tells it all: the post title has suddenly become very big. But even worse, the title is repeated

1. In big letters at the type are the words: Add Title.

2. Underneath that is Type / to choose a block

3. Underneath that is No Title

When I start typing the title, the title shows up in the Add Title space and the No Title Space.

If I type a title in the Type / to choose a block, the title shows up Three Times.

So what is going on. I have never had this problem. My WordPress is: 6.5.3.

My theme is Twenty Twenty-One, Version 2.2

I cannot post anything because of this problem.

The page I need help with: [log in to see the link]