Error in navigation bar for tablet/mobile breakpoints

Could someone help me with this please:

In the tablet and mobile views, when I click on the AI Advisory council and Young Stars pages, the grey band of the navigation bar does not disappear after the page has loaded. It works fine for the other 2 pages. I can’t seem to attach a screenshot here, but I can send you those once you respond.


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