Main menu items with child items not working properly

Hello,

Main menu items with drop-down/child items on my account's C******F***E******.com site has recently stopped working properly. Not sure when exactly this problem began (possibly with recent WP core update, but this is pure speculation).

Plugin conflict test rendered no useful insight.

Can you please look into this?

I have granted support access. Please use Cloner to clone main site and pefform tests and make changes there and not on main/live site.

Thank you.

Clyde