@baizhou
If you want someone to understand what you are doing and look at it you really need to supply us with a complete, compilable, minimal, reproducible example. We need actual code rather than your explanations. Qt Charts are known to work so it is unlikely to be some "bug" in their code.
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Unsolved qt charts module bug issues
• baizhou -
Unsolved Interfacing QT with MPU
• Seyad Anas Arif -
Solved Starting multiple android services
• Ivelin -
Unsolved QDateEdit Calendar Popup Issue
• timroberts -
Unsolved meta-Qt6 with eglfs
• Bjorn.Gurnett -
Solved Non-square pixel TFT and QML
• Landolfi -
Unsolved MediaPlayer on windows /RaspberryPi
• The Qt Mayssa -
Unsolved qt.qpa.xcb: could not connect to display
• Eighteen -
Unsolved Android device does not recognize apk.
• Stamat