Extremely large window elements in Ubuntu (gnome)

I am using Ubuntu 17.10 (Gnome desktop).
I have an external screen for my laptop. When using it, the Zotero Standalone window elements (top bar, text, etc.) are extremely large, which means I cannot add new references etc. (I cannot see the fields). I have the same problem (although not as big) with Firefox. Windows in other programs (Evolution, LibreOffice etc.) show up in a appropriate size.
Therefore I suspect that there is a DPI issue in Zotero's stand alone program.
Screenshot here (this shows the full width of the screen): https://sky.bundsgaard.net/index.php/s/ZsQ8qrHzeT7FH91
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