Looking at your screenshot, you appear to have added the Toggle Toolbars button to the editor toolbar. This button hides all toolbar rows below it until clicked.
In one of these hidden toolbars, you may have added the Joomla button (a button with an icon of the Joomla logo).
When the Joomla button is added to the toolbar, the editor-xtd buttons below the editor are moved to a dropdown menu on the Joomla button.