Onepage menu does not work on the bottom

Hi,
I have a one page website here. when I navigate on the start page, the jump labels work, example "video". The site then jumps down to the video part.

However, if I am on the gallery page https://www.pixelway.de/projekt-lokoben/galerie/, the links in the menu, example "Video" no longer work.
What can I do?
Thanks

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