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just a wild guess: looks like you have the bad and wrong widget style theme activated...could be the one from environment default... which may I ask what is?

anyway, run this from a terminal console:

qtractor -style Fusion

then, if it looks ok, go to View > Options... > Display > Custom > Style theme, and select anything but "(default)" or "Windows" (god forgive you:)); make it "Fusion" for life!

hth.
cheers