Hello,

I saw the screenshots you attached.

1) The sticky header inherits from the main header and its modules. If you want to display a custom sticky header then you need to select it as sticky from Woodmart >> Header Builder >> Edit Header.

Screenshot for Clarification: https://ibb.co/chhD0xL

You also need to edit the header settings from the left top and disable the sticky header clone to make your selected header a sticky header.

Screenshot for Clarification: https://ibb.co/YpmWNkJ

2) Please try adding the following Custom CSS in the Global Custom CSS area under Theme Settings >> Custom CSS.

.whb-top-bar {
    border-bottom: none;
}

Best Regards