menu not displaying correctly on my theme

The menu style (what it looks like, how it behaves, the link colors, font size, layout placement and other presentation-oriented issues) are/is determined by solely your theme style sheet – change the style-sheet CSS to work with the classes used by the NAVT plugin to create what you expect. The plugin does not presuppose, determine or dictate presentation. It creates a unordered list of HTML anchors (a.k.a. links). More information about menus and styles can be found in the NAVT forum at https://gbellucci.us/forums/ – if you need more help – try looking for information about CSS and style sheet modifications – more help? – contact me.