Int Variables in different Tkinter windows only returning 0

[Yoriz]

The code shown does not run, there is no tkinter import and data has not been defined.
Unable to compare if you are using the exact same code in main root window as secondary window as only one windows code is shown.
In the code shown when the Checkbutton's are created instead of each individual IntVar being passed as an argument to parameter variable, the whole button_list is being passed.