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yes, it might be normal...

from the menu Help > Configure... > Custom style theme, try something else but "(default)"...

it all depends on which and how many Qt widget styles you have installed ... looking at your screenshot it looks like the default widget style is the most despicable one there is: "windows" :)

my favorite is "Fusion" and that's exactly the one you see on the official screenshots here and there ;)
cheers