A series of issues.

Bugs with "indentations," the "edit" button, and "database problems" occur simultaneously and are accompanied by a message at the bottom of the screen that says:

An error occurred during the execution of the web page script. It is advisable to report it to the administration so that measures can be taken to fix it.

The error may have occurred due to an overload of the database; in this case, try logging in again by clicking the Refresh button in your browser.

However, neither "refreshing" nor "clearing the cache" helps.
The indentation bug appears not only in new messages but also in messages written "a long time ago."
The database bug only appears on the quick action button (and, contrary to the message about the inability to change the database, the change actually occurs). No problems were found with the comments.
The bug is difficult to detect because it appears at "random times."
Sometimes, instead of the bug, the forum simply does not load.