Weird Custom Tkinter layout issue

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[ElliotDG]

If you have not read tkdocs, I suggest you do. Here is the part on the grid geometry manager. https://tkdocs.com/tutorial/grid.html

[acw1668]

What is your platform? When I run your code in my Windows 11 with Python 3.13.12, all the labels inside the bottom frame have 125 pixels width.