I think that one of the lines says "Using calibre QT style: true" - it is very hard to read a picture, it would have been better to copy the text into a reply.
Mine says false there.
From the little output given by calibre, you may wish to try changing the qt style back to system default. It's in the Preferences - Look and Feel section in the main Calibre program.
However it makes no difference here how that is set but that is the only difference to my debug output.
Perhaps some on else will have an idea of what is going wrong.
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