One of my footnote citations suddenly shows full again?

Hi
I am struggling to figure out how to solve the following:

Using footnote citations. Citing full once and subsequent citations show abbreviations.
One of my citations then suddenly shows full again (despite being abbreviated earlier in the document and despite using the "already cited" option when I bring it up).

This citation does not seem to double saved in my library, but when it is brought up in the library (without a linkage to the document I am working on) it shows two persons over the picture before the title.

Hope this is clear and someone can help me how to fix this?
Thank you for your assistance.
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