sidebar menu duplicated after edit

Needed to do some minor edits to my site menu and after doing so, there is now a duplicate menu under the original. I haven’t made any structural changes to my site in years because I was ill, so I added the Classic Editor & Classic Widgets plugins so I wouldn’t have to figure out Blocks before making the changes. Not sure if this problem stems from these plugins, my Port theme (ThemeTrust), my wildly inadequate understanding of WP tools, or something else. I have similar trouble with the Formidable (lite) contact form in the aforementioned menu, which I updated and now displays a crappy looking new version on top of the old one. Many thanks for any insight!

The page I need help with: [log in to see the link]