@Merischino - try reconfiguring the keyboard (Find Duplicates Configuration).
After I changed Next Group from Right Arrow to Ctrl/Right Arrow and Previous Group from nothing to Ctrl/Left Arrow I found it much easier to drive Find Duplicates.
Re your OT item on Merging, I don't have an answer. I've been using Calibre for almost two years and the Merge has never worked for me either, I have always had the behaviour you describe. I don't have many to Merge since I did my initial upload, but when I do get one I do the merging manually.
BR
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