[SOLVED]Can't scroll back up when anchor links in menu are clicked

I have #id-links in the menu that links to anchors on the home page. When I am on the home page and click on a menu item it takes me down to that section, all fine, BUT when I now try to scroll back up it can’t scroll and it looks like everything above that section does not exist.

When I go to that same section via the menu from another page all is then fine and I can scroll back up.

Anybody knows what to do.

PS: sections are all “overflow-visible” the default setting.

SOLVED (I think):
I have Bricksforge and the Smooth Scroll in Bricksforge breaks sticky as well as the anchor link/navigation.
I reported this to BF and I think Daniele will sort out in good time.
Conflict on BF’s side.