One of the topics, for no apparent reason, began to display abnormally: comments are added to the side, stretching the screen, and not down. This distorts the layout. When you try to edit a topic from the administrator's profile, it throws it into the add comment window. In other topics, everything is fine.
Changed the topic to QA - now it is possible to edit the text of the topic. The problem turned out to be a spoiler: I edited it and everything went back to normal.