Gallery displays an additional grey picture

I just had to take over the website from a former graphic designer (which I am not…) and got pretty lost in fixing some bugs. One I can’t solve is an additional grey picture in almost all the galleries at the end.

eg here:

The CMS has no grey pictures loaded.
What can I do?
Thx for your help.


Here is my site Read-Only: LINK
(how to share your site Read-Only link)

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