Custom Menu on search result page

HI, Trying to figure this out but could not find anything

using the default theme 20/10

The whole site, both header and footer menus looks fine. Going to search.php page it looks fine too, but when i search for something and comes with results, both menus not showing the class and both have all pages listed

It only happens when it comes back with some search results.

Any ideas would be much appreciated

Thank you