Something weird up with the Wilder template

Imported Wilder as a template for a new site. There is just a little custom css adding a paper texture to the site.

The navigation is misbehaving, it doesn’t look like the example in the site library. For whatever reason, the menu toggle is appearing towards the middle of the nav (in desktop), and when clicking it, a second toggle appears (also in desktop). And both Book Now buttons are visible at the same time (I hid them both to try to pinpoint the menu toggle issue).

I imported the Wilder template to a dev site, where the nav worked as expected, and copied the blocks from the element, replacing what was in my site. Same thing, with the 2 menu toggles.

I then imported a site header pattern from the library and again both menu toggles appeared in desktop.

Any idea what’s the issue?