We have a weird problem where at some point our menu styles dropdown has disappeared from all menu items. We can see it in our old site, and we're pretty sure it used to be there, and we're not really sure when it disappeared or how to get it back. We can change it in our template by assigning it, so that's helpful, but for one page it's not working and we wondered if this was the reason.
In any case, we want our Joomla! working properly.
I have checked Admin Template Overrides there are none for menu items. I have used Joomla to reinstall Joomla using the Joomla updater.