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Webflow Mobile Menu stops displaying

Hi Folks,

Just trying to figure what causes a Webflow mobile menu to engage open/close and why would it suddenly stop working? What controls it’s visibility, etc? and does it involve js files or any other element files? I have two sites. Site A is a webflow dev site and Site B is a mirrored live site using native Webflow code.

Site A Link

Site B Link

Both these sites have identical code for their navigation etc. Can someone explain to me why when on mobile view, site B’s hamburger will not engage open the mobile navigation window? and on Site A it appears to open okay.
Thanks in advance.

Here is my site Read-Only: LINK
(how to share your site Read-Only link)

Item self resolved. It relates to components.css. Thanks again.