Thanks! Yes, I had a small glitch in my imports and I fetched more than 1 pic of the same galleries. I thought I fixed all of them, but it looks like I missed this one.
Removed those "multiple duplicates" now!
On some previews there is a link to the pic & one to the video, so there are 2 thumbs. I removed the pic-link for the future, but kept the exisiting ones....so this is "intended" ;)