Symptom

Current submenu open by default

When visiting a page, the submenu of the current menu item opens automatically without it being triggered by the user.
2 Potential Diagnoses

Residual styling from the theme is affecting the menu display 22 [ + ]

If your theme’s menu styles are based on a hard-coded element wrapping the menu, those styles will still apply after replacing the menu markup, and will conflict and negatively impact the style and functionality of the menu.

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Theme replaces current menu item classes with ‘active’ class 16 [ + ]

Some theme strip out core menu classes like the current-menu-item classes and replace them with their own ‘active’ class. This forces the menu open on page load.

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