App text is blurry

The text is blurred.

Step a:
1. In MacOS System Preferences, set General-> Appearance: to "Dark".
2. Launch the app. the text is blurry. (bug)
-> Screenshot_1_bug.png
3. Set Appearance to "Light" and back to "Dark" without exiting the app.
4. When I check the app, it draws normally. (correct state, text becomes sharp)
-> Screenshot_2.png

Step b:
1. Set Appearance to "Light" in MacOS System Preferences.
2. Launch the app. (correct state, text is sharp)
-> Screenshot_3.png
3. Set Appearance to "Dark" and then back to "Light" without exiting the app.
4. When I check the app, the text becomes blurry. (bug, thick text)
-> Screenshot_4_bug.png

Supplement:
All the text in the app is blurry.
(QLabel, QPushButton, QPainter (QWidget :: paintEvent ()), ... etc)

QPainter use "void QPainter::drawText(const QPoint &position, const QString &text)"