Hello jacputs,
Thank you for the link. I can see the years 2013 and 2014 in my browser (Firefox and Chrome). What I immediately notice is that the years 2023 to 2026 are displayed larger and have submenus. For the remaining years, which are displayed smaller, no submenus are shown.
Please check the following points:
- Check if the submenus actually have the "Parent Entry = 2013" (not "Main Entry" or another parent item).
- The access level must match the page (e.g., "Public"

, otherwise Joomla will build the structure, but the menu renderer/template won't display it. Sub-items from 2013/2014: Status = Published
- Sub-items are located in a different menu - It sounds trivial, but it happens often: 2013/2014 have sub-items that were accidentally created in a different menu. Dropdown menus only work within the same menu structure.
- Menu module/template only displays up to a certain level. - In the menu module (if a module is used for the main menu): Check parameters such as "Start Level" / "End Level" / "Maximum Levels".
Best regards