Problem with the duplication of my menu following an interaction

Hello everyone,

I have a problem with my menu, which is from systemflow. When in desktop mode I reduce the size of my window to reach the mobile or tablet menu and I click on the menu hamburger, then I rearrange my window to desktop size= I have my menu duplicated on the screen.

You can find the read only link from systemflow template. I use navbar light 4.

How do we prevent this?



Here is my site Read-Only: [LINK]