only half of the gallery is displayed

Good morning,
only half of the gallery is displayed. the upper part is not visible, although the images are all loaded in the gallery.
Thumbnails have been deleted.
Version Gridbox & Gallery are up to date.

Screen: https://prnt.sc/3DtDPxombofH
Link: http://www1.diemarketingarchitekten.de/

Do you have an idea here?
Thanks a lot!

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