Hi,
From what you said here
The code was placed in the Site Tab, but this doesn’t help because the anchor doesn’t repeat in the other pages anyway.
Can you try copying the anchors with the same Javascript ID (Example: anchor1 ) and then click on the onViewportEnter & onViewportLeave Function on the Properties Panel to activate it, by doing this you will get the regular export function… on your Page Tab.
Just delete the export function on the page tab and it should be fine.
Its not an exact solution but maybe you can try a workaround with something like this