Menu Bug

Hello
I’m testing the demo of the OnePress theme (https://demos.famethemes.com/onepress/) and I have a question about a bug in the main menu.
When you enter the demo and click on “FEATURES” its link is selected in blue. All right.
But when you continue browsing through other sections of the page and click on “FEATURES” in the main menu again, it does not remain selected in blue but instead remains gray.
Does this happen in general or is it a specific bug in this demo?

The page I need help with: [log in to see the link]