@jsulm @jsulm said in QtGraphs Bug: Look at these numbers. I doubt this is what you added. Yes, I agree the numbers are output strangely. @jsulm said in QtGraphs Bug: run the app in a terminal, then you should see the Python exception. Perhaps I don't have enough knowledge, I would be glad if you could explain how a regular terminal differs from a terminal in VS Code. I don't understand what new things I'll be able to see. I also see python exceptions in the VS Code terminal, but they were not noticed in this code. In any case, how can you explain that the same code works without problems when replacing QSplineSeries with QLineSeries, I attach a screenshot of an example of the work. [image: 33a49b14-9ee0-4b70-94c0-553c878b7d13.png]